LibVideo/VP9: Begin reference frame update process (8.10)

This was required for correctly parsing more than one frame's
height/width data properly. Additionally, start handling failure
a little more gracefully. Since we don't fully parse a tile before
starting to parse the next tile, we will now no longer make it past
the first tile mark, meaning we should not handle that scenario well.

Userland/Applications/VideoPlayer/main.cpp

@@ -43,8 +43,10 @@ int main(int argc, char** argv)
 
             auto const& frame = block.frame(0);
             dbgln("Reading frame 0 from block @ {}", block.timestamp());
-            vp9_decoder.decode_frame(frame);
+            bool failed = !vp9_decoder.decode_frame(frame);
             vp9_decoder.dump_frame_info();
+            if (failed)
+                return 1;
         }
     }