gre: use nla_get_be32() to extract flowinfo

Eliminate a sparse endianness mismatch warning, use nla_get_be32() to
extract a __be32 value instead of nla_get_u32().
Signed-off-by: Lance Richardson <lrichard@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv6/ip6_gre.c

@@ -1239,7 +1239,7 @@ static void ip6gre_netlink_parms(struct nlattr *data[],
 		parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
 
 	if (data[IFLA_GRE_FLOWINFO])
-		parms->flowinfo = nla_get_u32(data[IFLA_GRE_FLOWINFO]);
+		parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
 
 	if (data[IFLA_GRE_FLAGS])
 		parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);