avcodec/flashsvenc: Correct max dimension in error message

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit b1f59bb6)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/flashsvenc.c

@@ -111,7 +111,7 @@ static av_cold int flashsv_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 AVERROR_INVALIDDATA;
     }