xfrm: Convert xfrm_bundle_create() to dscp_t.

Use a dscp_t variable to store the result of xfrm_get_dscp().
This prepares for the future conversion of xfrm_dst_lookup().

Signed-off-by: Guillaume Nault <gnault@redhat.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

Author: Guillaume Nault

net/xfrm/xfrm_policy.c

@@ -2678,13 +2678,13 @@ static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
 	int header_len = 0;
 	int nfheader_len = 0;
 	int trailer_len = 0;
-	int tos;
 	int family = policy->selector.family;
 	xfrm_address_t saddr, daddr;
+	dscp_t dscp;
 
 	xfrm_flowi_addr_get(fl, &saddr, &daddr, family);
 
-	tos = inet_dscp_to_dsfield(xfrm_get_dscp(fl, family));
+	dscp = xfrm_get_dscp(fl, family);
 
 	dst_hold(dst);
 
@@ -2732,7 +2732,8 @@ static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
 				family = xfrm[i]->props.family;
 
 			oif = fl->flowi_oif ? : fl->flowi_l3mdev;
-			dst = xfrm_dst_lookup(xfrm[i], tos, oif,
+			dst = xfrm_dst_lookup(xfrm[i],
+					      inet_dscp_to_dsfield(dscp), oif,
 					      &saddr, &daddr, family, mark);
 			err = PTR_ERR(dst);
 			if (IS_ERR(dst))