nouveau: Silence a warning at -Og

   ../src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp: In member function ‘void nv50_ir::AlgebraicOpt::handleCVT_EXTBF(nv50_ir::Instruction*)’:
   ../src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp:2238:57: warning: ‘offset’ may be used uninitialized in this function [-Wmaybe-uninitialized]

Just set it to 0 to handle the corner case.
92 jobs for !8724 with warnings-at-Og in 8 seconds (queued for 5 seconds)
detached
Status Job ID Name Coverage
  Sanity
passed #6902756
sanity

00:00:08

 
  Container
manual #6902759
aarch64 manual
arm_build
manual #6902760
manual
arm_test-base
manual #6902761
windows shell 1809 mesa manual
windows_build_vs2019
manual #6902757
manual
x86_build-base
manual #6902758
manual
x86_test-base
 
  Container 2
created #6902769
android_build
created #6902772
arm64_test
created #6902773
armhf_test
created #6902766
i386_build
created #6902762
kernel+rootfs_amd64
created #6902763
aarch64
kernel+rootfs_arm64
created #6902764
aarch64
kernel+rootfs_armhf
created #6902767
ppc64el_build
created #6902768
s390x_build
created #6902765
x86_build
created #6902770
x86_test-gl
created #6902771
x86_test-vk
 
  Meson X86 64
created #6902779
meson-clang
created #6902780
meson-clover
created #6902776
meson-clover-testing
created #6902777
meson-gallium
created #6902778
meson-release
created #6902774
meson-testing
created #6902775
meson-testing-asan
created #6902781
meson-vulkan
 
  Build Misc
created #6902782
meson-android
created #6902784
aarch64
meson-arm64
created #6902785
aarch64
meson-arm64-build-test
created #6902783
aarch64
meson-armhf
created #6902788
meson-i386
created #6902791
meson-mingw32-x86_64
created #6902790
kvm
meson-ppc64el
created #6902789
kvm
meson-s390x
created #6902786
windows docker 1809 mesa
meson-windows-vs2019
created #6902787
allowed to fail
scons-win64
 
  Amd
created #6902792
mesa-ci-aarch64-lava-collabora
radeonsi-stoney-gles2:amd64
created #6902794
mesa-ci-aarch64-lava-collabora
radeonsi-stoney-gles31:amd64
created #6902793
mesa-ci-aarch64-lava-collabora
radeonsi-stoney-gles3:amd64
created #6902795
mesa-ci-aarch64-lava-collabora
radeonsi-stoney-traces:amd64
created #6902796
radv-fossils
 
  Arm
created #6902802
mesa-ci-aarch64-lava-collabora
panfrost-g52-gles2:arm64
created #6902803
mesa-ci-aarch64-lava-collabora
panfrost-g52-gles3:arm64
created #6902797
mesa-ci-aarch64-lava-collabora
panfrost-t720-gles2:arm64
created #6902798
mesa-ci-aarch64-lava-collabora
panfrost-t860-gles2:arm64
created #6902799
mesa-ci-aarch64-lava-collabora
panfrost-t860-gles3:arm64 1/2
created #6902800
mesa-ci-aarch64-lava-collabora
panfrost-t860-gles3:arm64 2/2
created #6902801
mesa-ci-aarch64-lava-collabora
panfrost-t860-traces:arm64
 
  Broadcom
created #6902804
igalia-rpi3
vc4-rpi3-gles2:armhf 1/4
created #6902805
igalia-rpi3
vc4-rpi3-gles2:armhf 2/4
created #6902806
igalia-rpi3
vc4-rpi3-gles2:armhf 3/4
created #6902807
igalia-rpi3
vc4-rpi3-gles2:armhf 4/4
 
  Freedreno
created #6902818
google-freedreno-db410c
arm64_a306_gles2
created #6902819
google-freedreno-db410c
arm64_a306_gles3
created #6902820
google-freedreno-db410c
arm64_a306_gles3_options
created #6902821
google-freedreno-db820c
arm64_a530_gles2 1/2
created #6902822
google-freedreno-db820c
arm64_a530_gles2 2/2
created #6902823
google-freedreno-db820c
arm64_a530_gles3
created #6902824
google-freedreno-db820c
arm64_a530_gles31
created #6902812
google-freedreno-cheza
arm64_a630_gl
created #6902809
google-freedreno-cheza
arm64_a630_gles2
created #6902811
google-freedreno-cheza
arm64_a630_gles3
created #6902810
google-freedreno-cheza
arm64_a630_gles31
created #6902813
google-freedreno-cheza
arm64_a630_gles_others
created #6902817
google-freedreno-cheza
arm64_a630_piglit_shader
created #6902808
google-freedreno-cheza
arm64-a630-traces
created #6902814
google-freedreno-cheza
arm64_a630_vk 1/2
created #6902815
google-freedreno-cheza
arm64_a630_vk 2/2
created #6902816
google-freedreno-cheza
arm64_a630_vk_sysmem
 
  Software Renderer
created #6902838
lavapipe-vk
created #6902830
llvmpipe-gles2
created #6902825
llvmpipe-piglit-cl
created #6902827
llvmpipe-piglit-glslparser
created #6902826
llvmpipe-piglit-quick_gl
created #6902828
llvmpipe-piglit-quick_shader
created #6902829
llvmpipe-traces
created #6902835
softpipe-asan-gles31
created #6902837
softpipe-gl
created #6902831
softpipe-gles2
created #6902832
softpipe-gles3
created #6902833
softpipe-gles31 1/2
created #6902834
softpipe-gles31 2/2
created #6902836
softpipe-piglit-quick
 
  Layered Backends
created #6902839
windows docker 1809 mesa
test-d3d12-windows
created #6902845
virgl-gl30-on-gl
created #6902846
virgl-gl31-on-gl
created #6902847
virgl-gl32-on-gl
created #6902841
virgl-gles2-on-gl
created #6902843
virgl-gles31-on-gl 1/2
created #6902844
virgl-gles31-on-gl 2/2
created #6902842
virgl-gles3-on-gl
created #6902840
virgl-traces