mesa: avoid returning a value in a void function

Fixes: 1d1722e9 ("mesa: add EXT_dsa NamedProgram functions")
Cc: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Signed-off-by: Eric Engestrom <eric.engestrom@intel.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
42 jobs for !3221 with arbprogram-return-null in 12 minutes and 20 seconds (queued for 4 seconds)
detached
Status Job ID Name Coverage
  Container
passed #1239520
aarch64
arm_build

00:00:34

passed #1239521
aarch64
arm_test

00:00:32

passed #1239514
lava_arm64

00:00:24

passed #1239512
lava_armhf

00:00:32

passed #1239515
x86_build

00:00:31

passed #1239518
x86_build_old

00:00:36

passed #1239517
x86_test-gl

00:00:24

 
  Build
passed #1239523
lava-build:arm64

00:02:25

passed #1239522
lava-build:armhf

00:02:39

passed #1239527
aarch64
meson-arm64

00:03:08

passed #1239526
aarch64
meson-armhf

00:02:40

passed #1239528
meson-clang

00:04:01

passed #1239531
meson-clover

00:04:00

passed #1239532
meson-clover-old-llvm

00:04:00

passed #1239534
meson-i386

00:02:34

passed #1239525
meson-main

00:02:29

passed #1239535
meson-mingw32-x86_64

00:02:40

passed #1239524
meson-testing

00:02:01

passed #1239533
meson-vulkan

00:04:28

passed #1239536
scons

00:05:09

passed #1239537
scons-old-llvm

00:02:25

passed #1239529
scons-swr

00:01:43

passed #1239530
scons-win64

00:01:40

 
  Test
passed #1239555
db410c
arm64_a306_gles2

00:04:54

passed #1239552
mesa-cheza
arm64_a630_gles2

00:01:36

passed #1239554
mesa-cheza
arm64_a630_gles3

00:06:10

passed #1239553
mesa-cheza
arm64_a630_gles31

00:04:05

passed #1239538
lava-sun50i-h6-pine-h64
panfrost-t720-test:arm64

00:08:03

passed #1239539
lava-rk3288-veyron-jaq
panfrost-t760-test:armhf

00:05:48

passed #1239540
lava-rk3399-gru-kevin
panfrost-t860-test:arm64

00:04:25

passed #1239542
piglit-glslparser

00:04:12

passed #1239541
piglit-quick_gl

00:09:46

passed #1239543
piglit-quick_shader

00:05:41

passed #1239544
test-llvmpipe-gles2

00:04:37

passed #1239545
test-softpipe-gles2

00:02:39

passed #1239548
test-softpipe-gles31 1/4

00:02:49

passed #1239546
test-softpipe-gles3 1/2

00:05:01

passed #1239549
test-softpipe-gles31 2/4

00:04:00

passed #1239550
test-softpipe-gles31 3/4

00:04:48

passed #1239551
test-softpipe-gles31 4/4

00:03:17

passed #1239547
test-softpipe-gles3 2/2

00:05:16

 
  External
passed continuous-integration/appveyor/branch