lavc/flashsv2enc: Fix encoding resolution error message.

libavcodec/flashsv2enc.c

@@ -192,7 +192,7 @@ static av_cold int flashsv2_encode_init(AVCodecContext * avctx)
 
     if ((avctx->width > 4095) || (avctx->height > 4095)) {
         av_log(avctx, AV_LOG_ERROR,
-               "Input dimensions too large, input must be max 4096x4096 !\n");
+               "Input dimensions too large, input must be max 4095x4095 !\n");
         return -1;
     }
     if ((avctx->width < 16) || (avctx->height < 16)) {