rtpenc_jpeg: handle case of picture dimensions not dividing by 8

This fixes the calculation of the number of needed blocks to make
sure that ALL pixels are represented by the result.
Reviewed-by: Thomas Volkert <silvo@gmx.net>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/rtpenc_jpeg.c

@@ -40,8 +40,8 @@ void ff_rtp_send_jpeg(AVFormatContext *s1, const uint8_t *buf, int size)
     s->timestamp = s->cur_timestamp;
 
     /* convert video pixel dimensions from pixels to blocks */
-    w = s1->streams[0]->codec->width  >> 3;
-    h = s1->streams[0]->codec->height >> 3;
+    w = FF_CEIL_RSHIFT(s1->streams[0]->codec->width, 3);
+    h = FF_CEIL_RSHIFT(s1->streams[0]->codec->height, 3);
 
     /* get the pixel format type or fail */
     if (s1->streams[0]->codec->pix_fmt == AV_PIX_FMT_YUVJ422P ||