Fix a bug in the DVD subtitle decoder where subtitles with odd heights would not

have the last line decoded, leaving the bottom line of the bitmap array
uninitialised. Patch by Ian Caulfield, ian dot caulfield gmail dot com.

Originally committed as revision 7767 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/dvdsubdec.c

@@ -249,7 +249,7 @@ static int decode_dvd_subtitles(AVSubtitle *sub_header,
                 sub_header->rects = av_mallocz(sizeof(AVSubtitleRect));
                 sub_header->num_rects = 1;
                 sub_header->rects[0].rgba_palette = av_malloc(4 * 4);
-                decode_rle(bitmap, w * 2, w, h / 2,
+                decode_rle(bitmap, w * 2, w, (h + 1) / 2,
                            buf, offset1 * 2, buf_size);
                 decode_rle(bitmap + w, w * 2, w, h / 2,
                            buf, offset2 * 2, buf_size);