ifconfig: Fix the build

Fix indentation in warn_nomask() while here.

Fixes:	54418f79fd ("ifconfig: switch IPv4/IPv6 address manipulations to Netlink")

sbin/ifconfig/af_inet.c

@@ -382,12 +382,12 @@ in_setdefaultmask_nl(void)
 #endif
 
 static void
-warn_nomask(ifflags)
+warn_nomask(int ifflags)
 {
-    if ((ifflags & (IFF_POINTOPOINT | IFF_LOOPBACK)) == 0) {
-	warnx("WARNING: setting interface address without mask "
-	    "is deprecated,\ndefault mask may not be correct.");
-    }
+	if ((ifflags & (IFF_POINTOPOINT | IFF_LOOPBACK)) == 0) {
+		warnx("WARNING: setting interface address without mask "
+		    "is deprecated,\ndefault mask may not be correct.");
+	}
 }
 
 static void