Merge remote-tracking branch 'qatar/master'

* qatar/master:
  rpza: limit the number of blocks to the total remaining blocks in the frame

See: 3819db74Merged-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/rpza.c

@@ -119,6 +119,8 @@ static void rpza_decode_stream(RpzaContext *s)
             }
         }
 
+        n_blocks = FFMIN(n_blocks, total_blocks);
+
         switch (opcode & 0xe0) {
 
         /* Skip blocks */