tipc: adjust tipc_nodeid2string() to return string length

Since the value returned by 'tipc_nodeid2string()' is not used, the
function may be adjusted to return the length of the result, which
is helpful to drop a few calls to 'strlen()' in 'tipc_link_create()'
and 'tipc_link_bc_create()'. Compile tested only.

Signed-off-by: Dmitry Antipov <[e-mail]>
Reviewed-by: Simon Horman <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Paolo Abeni <[e-mail]>

net/tipc/addr.c

···
 	pr_info("Node number set to %u\n", addr);
 }
 
-char *tipc_nodeid2string(char *str, u8 *id)
+int tipc_nodeid2string(char *str, u8 *id)
 {
 	int i;
 	u8 c;
···
 	if (i == NODE_ID_LEN) {
 		memcpy(str, id, NODE_ID_LEN);
 		str[NODE_ID_LEN] = 0;
-		return str;
+		return i;
 	}
 
 	/* Translate to hex string */
···
 	for (i = NODE_ID_STR_LEN - 2; str[i] == '0'; i--)
 		str[i] = 0;
 
-	return str;
+	return i + 1;
 }

net/tipc/addr.h

···
 bool tipc_in_scope(bool legacy_format, u32 domain, u32 addr);
 void tipc_set_node_id(struct net *net, u8 *id);
 void tipc_set_node_addr(struct net *net, u32 addr);
-char *tipc_nodeid2string(char *str, u8 *id);
+int tipc_nodeid2string(char *str, u8 *id);
 
 #endif

net/tipc/link.c

···
 
 	/* Set link name for unicast links only */
 	if (peer_id) {
-		tipc_nodeid2string(self_str, tipc_own_id(net));
-		if (strlen(self_str) > 16)
+		if (tipc_nodeid2string(self_str, tipc_own_id(net)) > NODE_ID_LEN)
 			sprintf(self_str, "%x", self);
-		tipc_nodeid2string(peer_str, peer_id);
-		if (strlen(peer_str) > 16)
+		if (tipc_nodeid2string(peer_str, peer_id) > NODE_ID_LEN)
 			sprintf(peer_str, "%x", peer);
 	}
 	/* Peer i/f name will be completed by reset/activate message */
···
 	if (peer_id) {
 		char peer_str[NODE_ID_STR_LEN] = {0,};
 
-		tipc_nodeid2string(peer_str, peer_id);
-		if (strlen(peer_str) > 16)
+		if (tipc_nodeid2string(peer_str, peer_id) > NODE_ID_LEN)
 			sprintf(peer_str, "%x", peer);
 		/* Broadcast receiver link name: "broadcast-link:<peer>" */
 		snprintf(l->name, sizeof(l->name), "%s:%s", tipc_bclink_name,