util: Don't destroy shaders null shaders

Fixes regression from a08e612fd8e7ca2ac2fef8961e56e5b094033717

diff --git a/src/gallium/auxiliary/util/u_gen_mipmap.c b/src/gallium/auxiliary/util/u_gen_mipmap.c
index 6fba6000ba889a3f2a497ced79f9f2906a093c81..4f1b0e71934a6d16286e9f165345a57979da8275 100644 (file)
--- a/src/gallium/auxiliary/util/u_gen_mipmap.c
+++ b/src/gallium/auxiliary/util/u_gen_mipmap.c
@@ -1451,8 +1451,10 @@ util_destroy_gen_mipmap(struct gen_mipmap_state *ctx)
 {
    struct pipe_context *pipe = ctx->pipe;
 
-   pipe->delete_fs_state(pipe, ctx->fs2da);
-   pipe->delete_fs_state(pipe, ctx->fs1da);
+   if (ctx->fs2da)
+      pipe->delete_fs_state(pipe, ctx->fs2da);
+   if (ctx->fs1da)
+      pipe->delete_fs_state(pipe, ctx->fs1da);
    pipe->delete_fs_state(pipe, ctx->fsCube);
    pipe->delete_fs_state(pipe, ctx->fs3d);
    pipe->delete_fs_state(pipe, ctx->fs2d);