drm/gk20a/fb: fix NULL dereference

gk20a_ram_put() can be called with a NULL nouveau_mem in case of error. Handle that case the way is it done in other RAM drivers.

Signed-off-by Alexandre Courbot <[email protected]>

---
 drivers/gpu/drm/nouveau/core/subdev/fb/ramgk20a.c | 2 ++
 1 file changed, 2 insertions(+)

drivers/gpu/drm/nouveau/core/subdev/fb/ramgk20a.c +2 -1

index 403c88f07b99..7effd1a63458 100644
@@ -36,6 +36,8 @@ gk20a_ram_put(struct nouveau_fb *pfb, struct nouveau_mem **pmem)
        int i;
 
        *pmem = NULL;
+       if (unlikely(mem == NULL))
+               return;
 
        for (i = 0; i < mem->size; i++) {
                struct page *page;
--

1.9.2

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