net/: Whenever the network initializes an IPv4 address, it must clear sin_zero.

net/netdev/netdev_ifconf.c

@@ -142,6 +142,7 @@ static int ifconf_ipv4_callback(FAR struct net_driver_s *dev, FAR void *arg)
           inaddr->sin_family = AF_INET;
           inaddr->sin_port   = 0;
           net_ipv4addr_copy(inaddr->sin_addr.s_addr, dev->d_ipaddr);
+          memset(inaddr->sin_zero, 0, sizeof(inaddr->sin_zero));
         }
 
       /* Increment the size of the buffer in any event */

net/netdev/netdev_ioctl.c

@@ -286,6 +286,7 @@ static void ioctl_get_ipv4addr(FAR struct sockaddr *outaddr,
   dest->sin_family              = AF_INET;
   dest->sin_port                = 0;
   dest->sin_addr.s_addr         = inaddr;
+  memset(dest->sin_zero, 0, sizeof(dest->sin_zero));
 }
 #endif
 
@@ -310,6 +311,7 @@ static void inline ioctl_get_ipv4broadcast(FAR struct sockaddr *outaddr,
   dest->sin_family              = AF_INET;
   dest->sin_port                = 0;
   dest->sin_addr.s_addr         = net_ipv4addr_broadcast(inaddr, netmask);
+  memset(dest->sin_zero, 0, sizeof(dest->sin_zero));
 }
 #endif