Fix init_get_bits length argument for init_get_bits.

Do not use rlelen for buffer size in init_get_bits, it is
only the size of the data for the first field.
Since it is not reliable, just use the size of the whole buffer.
Additional comments add removal of unused rlelen variable by
Reimar Döffinger.

libavcodec/xsubdec.c

@@ -51,7 +51,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
     AVSubtitle *sub = data;
     const uint8_t *buf_end = buf + buf_size;
     uint8_t *bitmap;
-    int w, h, x, y, rlelen, i;
+    int w, h, x, y, i;
     int64_t packet_time = 0;
     GetBitContext gb;
     int has_alpha = avctx->codec_tag == MKTAG('D','X','S','A');
@@ -83,7 +83,11 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
     // skip bottom right position, it gives no new information
     bytestream_get_le16(&buf);
     bytestream_get_le16(&buf);
-    rlelen = bytestream_get_le16(&buf);
+    // The following value is supposed to indicate the start offset
+    // (relative to the palette) of the data for the second field,
+    // however there are files  where it has a bogus value and thus
+    // we just ignore it
+    bytestream_get_le16(&buf);
 
     // allocate sub and set values
     sub->rects =  av_mallocz(sizeof(*sub->rects));
@@ -105,8 +109,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
         ((uint32_t*)sub->rects[0]->pict.data[1])[i] |= (has_alpha ? *buf++ : (i ? 0xff : 0)) << 24;
 
     // process RLE-compressed data
-    rlelen = FFMIN(rlelen, buf_end - buf);
-    init_get_bits(&gb, buf, rlelen * 8);
+    init_get_bits(&gb, buf, (buf_end - buf) * 8);
     bitmap = sub->rects[0]->pict.data[0];
     for (y = 0; y < h; y++) {
         // interlaced: do odd lines