net: fix a sparse warning

Fix a sparse warning introduced by Commit
0b5e8b8eeae40bae6ad7c7e91c97c3c0d0e57882 (net: Add Geneve tunneling
protocol driver) caught by kbuild test robot:

# apt-get install sparse
# git checkout 0b5e8b8eeae40bae6ad7c7e91c97c3c0d0e57882
# make ARCH=x86_64 allmodconfig
# make C=1 CF=-D__CHECK_ENDIAN__
#
#
# sparse warnings: (new ones prefixed by >>)
#
# >> net/ipv4/geneve.c:230:42: sparse: incorrect type in assignment (different base types)
# net/ipv4/geneve.c:230:42: expected restricted __be32 [addressable] [assigned] [usertype] s_addr
# net/ipv4/geneve.c:230:42: got unsigned long [unsigned] <noident>
#

Reported-by: kbuild test robot <[e-mail]>
Signed-off-by: Andy Zhou <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/ipv4/geneve.c

···
 		udp_conf.family = AF_INET6;
 	} else {
 		udp_conf.family = AF_INET;
-		udp_conf.local_ip.s_addr = INADDR_ANY;
+		udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
 	}
 
 	udp_conf.local_udp_port = port;