glsl: Protect against double compiler-destroy.

DRI was doing teardown when we close the last screen, then an atexit()
was added to call it as well.

diff --git a/src/glsl/builtins/tools/generate_builtins.py b/src/glsl/builtins/tools/generate_builtins.py
index b9f0ba1ad2285c68b83e71f0557c9e399e46e32b..ab5b3777cb7ae129e9619f705de87665ef2af522 100755 (executable)
--- a/src/glsl/builtins/tools/generate_builtins.py
+++ b/src/glsl/builtins/tools/generate_builtins.py
@@ -175,6 +175,7 @@ void
 _mesa_glsl_release_functions(void)
 {
     talloc_free(builtin_mem_ctx);
+    builtin_mem_ctx = NULL;
 }
 
 void