st/nine: Fix compilation error on non-x86 platforms

The unused variable was improperly declared.

Closes: #4647
Fixes: d9e79bfe ("st/nine: Disable fpu exceptions during init")

Signed-off-by: Axel Davy <davyaxel0@gmail.com>
Reviewed-by: Timur Kristóf <timur.kristof@gmail.com>
Part-of: <!10263>
35 jobs for !10263 with nine_compilation_fix in 9 minutes and 27 seconds (queued for 2 seconds)
latest detached
Status Name Job ID Coverage
  Sanity
passed sanity #8949249

00:00:08

 
  Container
passed arm_build #8949254
aarch64

00:00:20

passed windows_build_vs2019 #8949256
windows shell 1809 mesa

00:00:08

passed x86_build-base #8949251

00:00:19

passed x86_test-base #8949252

00:00:19

 
  Container 2
passed android_build #8949270

00:00:19

passed i386_build #8949265

00:00:15

passed kernel+rootfs_amd64 #8949258

00:00:11

passed kernel+rootfs_arm64 #8949260
aarch64

00:00:11

passed kernel+rootfs_arm64-baremetal #8949275
aarch64

00:00:10

passed kernel+rootfs_armhf #8949262
aarch64

00:00:11

passed kernel+rootfs_armhf-baremetal #8949277
aarch64

00:01:13

passed ppc64el_build #8949267

00:00:15

passed s390x_build #8949268

00:00:15

passed x86_build #8949264

00:00:15

passed x86_test-gl #8949272

00:00:16

passed x86_test-vk #8949273

00:00:17

 
  Meson X86 64
passed meson-clang #8949287

00:08:38

passed meson-clover #8949289

00:03:13

passed meson-clover-testing #8949282

00:03:11

passed meson-gallium #8949284

00:05:19

passed meson-release #8949286

00:03:29

passed meson-testing #8949279

00:03:13

passed meson-testing-asan #8949281

00:03:53

passed meson-vulkan #8949291

00:03:08

 
  Build Misc
passed arm_test #8949292

00:00:21

passed meson-android #8949294

00:00:38

passed meson-arm64 #8949298
aarch64

00:01:25

passed meson-arm64-asan #8949300
aarch64

00:02:39

passed meson-arm64-build-test #8949302
aarch64

00:01:17

passed meson-armhf #8949296
aarch64

00:01:35

passed meson-i386 #8949304

00:00:51

passed meson-mingw32-x86_64 #8949309

00:01:35

passed meson-ppc64el #8949307

00:02:05

passed meson-s390x #8949305
kvm

00:02:37