xfrm: compat: change expression for switch in xfrm_xlate64

Compare XFRM_MSG_NEWSPDINFO (value from netlink
configuration messages enum) with nlh_src->nlmsg_type
instead of nlh_src->nlmsg_type - XFRM_MSG_BASE.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: 4e950506 ("net/xfrm/compat: Copy xfrm_spdattr_type_t atributes")
Signed-off-by: Anastasia Belova <abelova@astralinux.ru>
Acked-by: Dmitry Safonov <0x7f454c46@gmail.com>
Tested-by: Dmitry Safonov <0x7f454c46@gmail.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

net/xfrm/xfrm_compat.c

@@ -302,7 +302,7 @@ static int xfrm_xlate64(struct sk_buff *dst, const struct nlmsghdr *nlh_src)
 	nla_for_each_attr(nla, attrs, len, remaining) {
 		int err;
 
-		switch (type) {
+		switch (nlh_src->nlmsg_type) {
 		case XFRM_MSG_NEWSPDINFO:
 			err = xfrm_nla_cpy(dst, nla, nla_len(nla));
 			break;