cso: possible null pointer dereference

reported by clang static analyzer

diff --git a/src/gallium/auxiliary/cso_cache/cso_cache.c b/src/gallium/auxiliary/cso_cache/cso_cache.c
index 0bc77a572879c12a1602d2ffca689b64f90e47be..e6dce3f0e5bc07fa81c8de4be2c019e410209844 100644 (file)
--- a/src/gallium/auxiliary/cso_cache/cso_cache.c
+++ b/src/gallium/auxiliary/cso_cache/cso_cache.c
@@ -361,6 +361,10 @@ void cso_for_each_state(struct cso_cache *sc, enum cso_cache_type type,
 void cso_cache_delete(struct cso_cache *sc)
 {
    assert(sc);
+
+   if (!sc)
+      return;
+
    /* delete driver data */
    cso_for_each_state(sc, CSO_BLEND, delete_blend_state, 0);
    cso_for_each_state(sc, CSO_DEPTH_STENCIL_ALPHA, delete_depth_stencil_state, 0);