macosx: fix some strdup memleaks

modules/gui/macosx/prefs_widgets.m

@@ -859,9 +859,12 @@ o_textfield = [[[NSSecureTextField alloc] initWithFrame: s_rc] retain];     \
     case CONFIG_ITEM_DIRECTORY:
     case CONFIG_ITEM_MODULE:
     case CONFIG_ITEM_MODULE_LIST:
-    case CONFIG_ITEM_MODULE_LIST_CAT:
-        config_PutPsz(VLCIntf, psz_name, [self stringValue]);
+    case CONFIG_ITEM_MODULE_LIST_CAT: {
+        char *psz_val = [self stringValue];
+        config_PutPsz(VLCIntf, psz_name, psz_val);
+        free(psz_val);
         break;
+    }
     case CONFIG_ITEM_KEY:
         /* So you don't need to restart to have the changes take effect */
         val.i_int = [self intValue];

modules/gui/macosx/simple_prefs.m

@@ -771,7 +771,7 @@ static inline void save_module_list(intf_thread_t * p_intf, id object, const cha
 
         if (p_item->i_type == CONFIG_ITEM_MODULE && module_provides(p_parser, p_item->psz_type)) {
             if ([objectTitle isEqualToString: _NS(module_GetLongName(p_parser))]) {
-                config_PutPsz(p_intf, name, strdup(module_get_name(p_parser, false)));
+                config_PutPsz(p_intf, name, module_get_name(p_parser, false));
                 break;
             }
         }