net: caif: fix error code handling

cfpkt_peek_head return 0 and 1, caller is checking error using <0

Signed-off-by: Tong Zhang <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/caif/cfrfml.c

···
 	if (segmented) {
 		if (rfml->incomplete_frm == NULL) {
 			/* Initial Segment */
-			if (cfpkt_peek_head(pkt, rfml->seghead, 6) < 0)
+			if (cfpkt_peek_head(pkt, rfml->seghead, 6) != 0)
 				goto out;
 
 			rfml->pdu_size = get_unaligned_le16(rfml->seghead+4);
···
 	if (cfpkt_getlen(pkt) > rfml->fragment_size + RFM_HEAD_SIZE)
 		err = cfpkt_peek_head(pkt, head, 6);
 
-	if (err < 0)
+	if (err != 0)
 		goto out;
 
 	while (cfpkt_getlen(frontpkt) > rfml->fragment_size + RFM_HEAD_SIZE) {