pp_free_bos dereferences ppq without a null check.

Fixes "Dereference before null check" defect reported by Coverity.

Signed-off-by: Vinson Lee <v...@freedesktop.org>
---
 src/gallium/auxiliary/postprocess/pp_init.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/gallium/auxiliary/postprocess/pp_init.c 
b/src/gallium/auxiliary/postprocess/pp_init.c
index 201a357..a49a23d 100644
--- a/src/gallium/auxiliary/postprocess/pp_init.c
+++ b/src/gallium/auxiliary/postprocess/pp_init.c
@@ -169,7 +169,9 @@ pp_free(struct pp_queue_t *ppq)
 {
    unsigned int i, j;
 
-   pp_free_fbos(ppq);
+   if (ppq) {
+      pp_free_fbos(ppq);
+   }
 
    if (ppq && ppq->p) {
       if (ppq->p->pipe && ppq->filters && ppq->shaders) {
-- 
1.8.3.2

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