Check for unsupported QMP command

Check for an unsupported QMP command when using the query-tpm-models
and query-tpm-types commands before checking for general errors
in order to avoid error messages in the log.
Signed-off-by: NStefan Berger <stefanb@linux.vnet.ibm.com>

src/qemu/qemu_monitor_json.c

@@ -4774,8 +4774,12 @@ qemuMonitorJSONGetStringArray(qemuMonitorPtr mon, const char *qmpCmd,
 
     ret = qemuMonitorJSONCommand(mon, cmd, &reply);
 
-    if (ret == 0)
+    if (ret == 0) {
+        if (qemuMonitorJSONHasError(reply, "CommandNotFound"))
+            goto cleanup;
+
         ret = qemuMonitorJSONCheckError(cmd, reply);
+    }
 
     if (ret < 0)
         goto cleanup;