clover: Add constructor for sampler_argument.

Fix defects reported by Coverity Scan.

member_not_init_in_gen_ctor: The compiler-generated constructor for this class does not initialize s.
member_not_init_in_gen_ctor: The compiler-generated constructor for this class does not initialize st.

Signed-off-by: Vinson Lee <vlee@freedesktop.org>
Reviewed-by: Dave Airlie <airlied@redhat.com>
Part-of: <!8657>
37 jobs for !8657 with fix-cid-1213937 in 7 minutes and 43 seconds (queued for 3 seconds)
latest detached
Status Job ID Name Coverage
  Sanity
passed #8169637
sanity

00:00:14

 
  Container
passed #8169642
aarch64
arm_build

00:00:19

passed #8169644
arm_test-base

00:00:28

passed #8169646
windows shell 1809 mesa
windows_build_vs2019

00:00:46

passed #8169639
x86_build-base

00:00:30

passed #8169641
x86_test-base

00:00:29

 
  Container 2
passed #8169661
android_build

00:00:20

passed #8169666
arm64_test

00:00:18

passed #8169668
armhf_test

00:00:20

passed #8169656
i386_build

00:00:17

passed #8169649
kernel+rootfs_amd64

00:00:24

passed #8169650
aarch64
kernel+rootfs_arm64

00:00:55

passed #8169652
aarch64
kernel+rootfs_armhf

00:00:12

passed #8169658
ppc64el_build

00:00:22

passed #8169659
s390x_build

00:00:17

passed #8169654
x86_build

00:00:16

passed #8169663
x86_test-gl

00:00:19

passed #8169665
x86_test-vk

00:00:23

 
  Meson X86 64
passed #8169679
meson-clang

00:04:12

passed #8169680
meson-clover

00:02:14

passed #8169673
meson-clover-testing

00:01:19

passed #8169675
meson-gallium

00:05:13

passed #8169677
meson-release

00:03:57

passed #8170390
meson-testing

00:01:17

passed #8169671
meson-testing-asan

00:02:54

passed #8169681
meson-vulkan

00:05:21

failed #8169670
meson-testing

01:00:03

 
  Build Misc
passed #8169682
meson-android

00:00:41

passed #8169684
aarch64
meson-arm64

00:01:30

passed #8169685
aarch64
meson-arm64-asan

00:02:54

passed #8169686
aarch64
meson-arm64-build-test

00:01:22

passed #8169683
aarch64
meson-armhf

00:01:42

passed #8169687
meson-i386

00:01:42

passed #8169690
meson-mingw32-x86_64

00:02:05

passed #8169689
kvm
meson-ppc64el

00:02:05

passed #8169688
kvm
meson-s390x

00:02:41

 
  Software Renderer
passed #8169691
llvmpipe-piglit-cl

00:02:58