avcodec/asvdec: Use init_get_bits8()

Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

libavcodec/asvdec.c

@@ -235,7 +235,9 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
             a->bitstream_buffer[i] = ff_reverse[buf[i]];
     }
 
-    init_get_bits(&a->gb, a->bitstream_buffer, buf_size * 8);
+    ret = init_get_bits8(&a->gb, a->bitstream_buffer, buf_size);
+    if (ret < 0)
+        return ret;
 
     for (mb_y = 0; mb_y < a->mb_height2; mb_y++) {
         for (mb_x = 0; mb_x < a->mb_width2; mb_x++) {