*: fix in_addr initialisers

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
diff --git a/bgpd/bgp_snmp.c b/bgpd/bgp_snmp.c
index 0f4aeec..6a57834 100644
--- a/bgpd/bgp_snmp.c
+++ b/bgpd/bgp_snmp.c
@@ -121,7 +121,7 @@
 oid bgp_trap_oid [] = { BGP4MIB, 0 };
 
 /* IP address 0.0.0.0. */
-static struct in_addr bgp_empty_addr = {0};
+static struct in_addr bgp_empty_addr = { .s_addr = 0 };
 
 /* Hook functions. */
 static u_char *bgpVersion (struct variable *, oid [], size_t *, int,