monitor: Fix leakage during completion processing

Given too many arguments or an invalid command, we were leaking the
duplicated argument strings.
Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: NLuiz Capitulino <lcapitulino@redhat.com>

monitor.c

@@ -3882,8 +3882,9 @@ static void monitor_find_completion(const char *cmdline)
        next arg */
     len = strlen(cmdline);
     if (len > 0 && qemu_isspace(cmdline[len - 1])) {
-        if (nb_args >= MAX_ARGS)
-            return;
+        if (nb_args >= MAX_ARGS) {
+            goto cleanup;
+        }
         args[nb_args++] = qemu_strdup("");
     }
     if (nb_args <= 1) {
@@ -3898,12 +3899,15 @@ static void monitor_find_completion(const char *cmdline)
         }
     } else {
         /* find the command */
-        for(cmd = mon_cmds; cmd->name != NULL; cmd++) {
-            if (compare_cmd(args[0], cmd->name))
-                goto found;
+        for (cmd = mon_cmds; cmd->name != NULL; cmd++) {
+            if (compare_cmd(args[0], cmd->name)) {
+                break;
             }
-        return;
-    found:
+        }
+        if (!cmd->name) {
+            goto cleanup;
+        }
+
         ptype = next_arg_type(cmd->args_type);
         for(i = 0; i < nb_args - 2; i++) {
             if (*ptype != '\0') {
@@ -3953,8 +3957,11 @@ static void monitor_find_completion(const char *cmdline)
             break;
         }
     }
-    for(i = 0; i < nb_args; i++)
+
+cleanup:
+    for (i = 0; i < nb_args; i++) {
         qemu_free(args[i]);
+    }
 }
 
 static int monitor_can_read(void *opaque)