avcodec/pictordec: Remove mid exit branch

This causes the RLE decoder to exit before applying the last RLE run
All images i tested with are unchanged, this makes the special case
for handling the last run unused for non truncated images.

Reviewed-by: Peter Ross <pross@xvid.org>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 88f0e05c72)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/pictordec.c

@@ -223,8 +223,6 @@ static int decode_frame(AVCodecContext *avctx,
                         run = bytestream2_get_le16(&s->g);
                     val = bytestream2_get_byte(&s->g);
                 }
-                if (!bytestream2_get_bytes_left(&s->g))
-                    break;
 
                 if (bits_per_plane == 8) {
                     picmemset_8bpp(s, frame, val, run, &x, &y);