qapi net: Elide redundant has_FOO in generated C

The has_FOO for pointer-valued FOO are redundant, except for arrays.
They are also a nuisance to work with.  Recent commit "qapi: Start to
elide redundant has_FOO in generated C" provided the means to elide
them step by step.  This is the step for qapi/net.json.

Said commit explains the transformation in more detail.  The invariant
violations mentioned there do not occur here.

Cc: Jason Wang <jasowang@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20221104160712.3005652-19-armbru@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
[Fixes for MacOS squashed in]
diff --git a/net/socket.c b/net/socket.c
index e62137c..b67437a 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -705,19 +705,19 @@
     assert(netdev->type == NET_CLIENT_DRIVER_SOCKET);
     sock = &netdev->u.socket;
 
-    if (sock->has_fd + sock->has_listen + sock->has_connect + sock->has_mcast +
-        sock->has_udp != 1) {
+    if (!!sock->fd + !!sock->listen + !!sock->connect + !!sock->mcast +
+        !!sock->udp != 1) {
         error_setg(errp, "exactly one of listen=, connect=, mcast= or udp="
                    " is required");
         return -1;
     }
 
-    if (sock->has_localaddr && !sock->has_mcast && !sock->has_udp) {
+    if (sock->localaddr && !sock->mcast && !sock->udp) {
         error_setg(errp, "localaddr= is only valid with mcast= or udp=");
         return -1;
     }
 
-    if (sock->has_fd) {
+    if (sock->fd) {
         int fd, ret;
 
         fd = monitor_fd_param(monitor_cur(), sock->fd, errp);
@@ -737,7 +737,7 @@
         return 0;
     }
 
-    if (sock->has_listen) {
+    if (sock->listen) {
         if (net_socket_listen_init(peer, "socket", name, sock->listen, errp)
             < 0) {
             return -1;
@@ -745,7 +745,7 @@
         return 0;
     }
 
-    if (sock->has_connect) {
+    if (sock->connect) {
         if (net_socket_connect_init(peer, "socket", name, sock->connect, errp)
             < 0) {
             return -1;
@@ -753,7 +753,7 @@
         return 0;
     }
 
-    if (sock->has_mcast) {
+    if (sock->mcast) {
         /* if sock->localaddr is missing, it has been initialized to "all bits
          * zero" */
         if (net_socket_mcast_init(peer, "socket", name, sock->mcast,
@@ -763,8 +763,8 @@
         return 0;
     }
 
-    assert(sock->has_udp);
-    if (!sock->has_localaddr) {
+    assert(sock->udp);
+    if (!sock->localaddr) {
         error_setg(errp, "localaddr= is mandatory with udp=");
         return -1;
     }