vo_gpu: fix crash if dither texture fails to allocate

Theoretically possible (and quite unlikely due to the small texture
size). The code was originally written with the assumption that texture
allocations can't fail, and it was never updated out of laziness.
Untested.

1 files changed, 3 insertions, 0 deletions

diff --git a/video/out/gpu/video.c b/video/out/gpu/video.c
index 3ec5cdfcd9..88a8557cc2 100644
--- a/video/out/gpu/video.c
+++ b/video/out/gpu/video.c
@@ -2764,6 +2764,9 @@ static void pass_dither(struct gl_video *p)
         debug_check_gl(p, "dither setup");
 
         talloc_free(temp);
+
+        if (!p->dither_texture)
+            return;
     }
 
     GLSLF("// dithering\n");