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id3v2: don't stop at false frame sync

--- a/id3v2.c

+++ b/id3v2.c

@@ -438,9 +438,12 @@

 			if(isid3(d))

 				goto header;

 		}

-		if((b = memchr(ctx->buf, 0xff, sz-1)) != nil && (b[1] & 0xe0) == 0xe0){

-			offset = ctx->seek(ctx, (char*)b - ctx->buf + offset + exsz, 0);

-			break;

+		for(b = (uchar*)ctx->buf; (b = memchr(b, 0xff, sz-3)) != nil; b++){

+			if((b[1] & 0xe0) == 0xe0){

+				offset = ctx->seek(ctx, (char*)b - ctx->buf + offset + exsz, 0);

+				exsz = 2048;

+				break;

+			}

 		}

 	}