sbgdec: Replace ELOOP by -1 to fix compilation on win32.

This should be replaced by a more appropriate error code of course but
we should not leave compilation broken until that is decided.

Found-by: jb
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/sbgdec.c

@@ -948,7 +948,7 @@ static int expand_tseq(void *log, struct sbg_script *s, int *nb_ev_max,
     if (tseq->lock++) {
         av_log(log, 16, "Recursion loop on \"%.*s\"\n",
                tseq->name_len, tseq->name);
-        return AVERROR(ELOOP);
+        return -1;
     }
     t0 += tseq->ts.t;
     for (i = 0; i < s->nb_def; i++) {