qapi block: 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/block*.json.

Said commit explains the transformation in more detail.

There is one instance of the invariant violation mentioned there:
qcow2_signal_corruption() passes false, "" when node_name is an empty
string.  Take care to pass NULL then.

The previous two commits cleaned up two more.

Additionally, helper bdrv_latency_histogram_stats() loses its output
parameters and returns a value instead.

Cc: Kevin Wolf <kwolf@redhat.com>
Cc: Hanna Reitz <hreitz@redhat.com>
Cc: qemu-block@nongnu.org
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20221104160712.3005652-11-armbru@redhat.com>
[Fixes for #ifndef LIBRBD_SUPPORTS_ENCRYPTION and MacOS squashed in]

1 files changed, 4 insertions, 5 deletions

diff --git a/blockdev-nbd.c b/blockdev-nbd.c
index 012256b..2130124 100644
--- a/blockdev-nbd.c
+++ b/blockdev-nbd.c
@@ -173,8 +173,8 @@ void nbd_server_start_options(NbdServerOptions *arg, Error **errp)
 }
 
 void qmp_nbd_server_start(SocketAddressLegacy *addr,
-                          bool has_tls_creds, const char *tls_creds,
-                          bool has_tls_authz, const char *tls_authz,
+                          const char *tls_creds,
+                          const char *tls_authz,
                           bool has_max_connections, uint32_t max_connections,
                           Error **errp)
 {
@@ -200,8 +200,7 @@ void qmp_nbd_server_add(NbdServerAddOptions *arg, Error **errp)
      * block-export-add would default to the node-name, but we may have to use
      * the device name as a default here for compatibility.
      */
-    if (!arg->has_name) {
-        arg->has_name = true;
+    if (!arg->name) {
         arg->name = g_strdup(arg->device);
     }
 
@@ -215,7 +214,7 @@ void qmp_nbd_server_add(NbdServerAddOptions *arg, Error **errp)
     };
     QAPI_CLONE_MEMBERS(BlockExportOptionsNbdBase, &export_opts->u.nbd,
                        qapi_NbdServerAddOptions_base(arg));
-    if (arg->has_bitmap) {
+    if (arg->bitmap) {
         BlockDirtyBitmapOrStr *el = g_new(BlockDirtyBitmapOrStr, 1);
 
         *el = (BlockDirtyBitmapOrStr) {