avcodec/dnxhd_parser: Optimize insufficient buf size case

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/dnxhd_parser.c

@@ -88,6 +88,10 @@ static int dnxhd_find_frame_end(DNXHDParserContext *dctx,
                     return remaining;
                 } else {
                     dctx->remaining -= buf_size;
+                    // Update variables for correctness, they are currently not used beyond here
+                    state = -1;
+                    dctx->cur_byte += buf_size - i;
+                    break;
                 }
             }
         }