Make the MJPEG decoder return -1 when no image was decoded so that decode

errors are actually recognizable as such.


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@19343 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavcodec/mjpegdec.c

@@ -1479,6 +1479,8 @@ not_the_end:
             }
         }
     }
+    av_log(avctx, AV_LOG_FATAL, "No JPEG data found in image\n");
+    return -1;
 the_end:
     av_log(avctx, AV_LOG_DEBUG, "mjpeg decode frame unused %td bytes\n", buf_end - buf_ptr);
 //    return buf_end - buf_ptr;