treewide: Use sa_family_t for address family variables

Sometimes we use sa_family_t for variables and parameters containing a
socket address family, other times we use a plain int.  Since sa_family_t
is what's actually used in struct sockaddr and friends, standardise on
that.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

util.c

@@ -97,7 +97,7 @@ found:
  *
  * Return: newly created socket, negative error code on failure
  */
-int sock_l4(const struct ctx *c, int af, uint8_t proto,
+int sock_l4(const struct ctx *c, sa_family_t af, uint8_t proto,
 	    const void *bind_addr, const char *ifname, uint16_t port,
 	    uint32_t data)
 {