ipv6: move from strlcpy with unused retval to strscpy

Follow the advice of the below link and prefer 'strscpy' in this
subsystem. Conversion is 1:1 because the return value is not used.
Generated by a coccinelle script.

Link: https://lore.kernel.org/r/CAHk-=wgfRnXz0W3D37d01q3JFkr_i_uTL=V6A6G1oUZcprmknw@mail.gmail.com/
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/20220818210220.8491-1-wsa+renesas@sang-engineering.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

net/ipv6/ip6_gre.c

@@ -360,7 +360,7 @@ static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
 	if (parms->name[0]) {
 		if (!dev_valid_name(parms->name))
 			return NULL;
-		strlcpy(name, parms->name, IFNAMSIZ);
+		strscpy(name, parms->name, IFNAMSIZ);
 	} else {
 		strcpy(name, "ip6gre%d");
 	}

net/ipv6/ip6_tunnel.c

@@ -293,7 +293,7 @@ static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
 	if (p->name[0]) {
 		if (!dev_valid_name(p->name))
 			goto failed;
-		strlcpy(name, p->name, IFNAMSIZ);
+		strscpy(name, p->name, IFNAMSIZ);
 	} else {
 		sprintf(name, "ip6tnl%%d");
 	}

net/ipv6/ip6_vti.c

@@ -211,7 +211,7 @@ static struct ip6_tnl *vti6_tnl_create(struct net *net, struct __ip6_tnl_parm *p
 	if (p->name[0]) {
 		if (!dev_valid_name(p->name))
 			goto failed;
-		strlcpy(name, p->name, IFNAMSIZ);
+		strscpy(name, p->name, IFNAMSIZ);
 	} else {
 		sprintf(name, "ip6_vti%%d");
 	}

net/ipv6/sit.c

@@ -254,7 +254,7 @@ static struct ip_tunnel *ipip6_tunnel_locate(struct net *net,
 	if (parms->name[0]) {
 		if (!dev_valid_name(parms->name))
 			goto failed;
-		strlcpy(name, parms->name, IFNAMSIZ);
+		strscpy(name, parms->name, IFNAMSIZ);
 	} else {
 		strcpy(name, "sit%d");
 	}