rv34: Avoid NULL dereference on corrupted bitstream

rv34_decode_slice() can return without allocating any pictures.

Signed-off-by: Martin Storsjö <martin@martin.st>
(cherry picked from commit d0f6ab0298f2309c6104626787ed73416298b019)

Signed-off-by: Anton Khirnov <anton@khirnov.net>
1 file changed