Corrected function parameter check

Author: Mika Leppänen

source/6LoWPAN/MAC/mac_helper.c

@@ -406,19 +406,20 @@ int8_t mac_helper_security_key_to_descriptor_set(protocol_interface_info_entry_t
 
 int8_t mac_helper_security_key_descriptor_clear(protocol_interface_info_entry_t *interface, uint8_t descriptor)
 {
-    if (interface->mac_api) {
-        mlme_set_t set_req;
-        mlme_key_descriptor_entry_t key_description;
-        memset(&key_description, 0, sizeof(mlme_key_descriptor_entry_t));
-
-        set_req.attr = macKeyTable;
-        set_req.value_pointer = &key_description;
-        set_req.value_size = sizeof(mlme_key_descriptor_entry_t);
-        set_req.attr_index = descriptor;
-        interface->mac_api->mlme_req(interface->mac_api, MLME_SET, &set_req);
-        return 0;
+    if (!interface->mac_api) {
+        return -1;
     }
-    return -1;
+
+    mlme_set_t set_req;
+    mlme_key_descriptor_entry_t key_description;
+    memset(&key_description, 0, sizeof(mlme_key_descriptor_entry_t));
+
+    set_req.attr = macKeyTable;
+    set_req.value_pointer = &key_description;
+    set_req.value_size = sizeof(mlme_key_descriptor_entry_t);
+    set_req.attr_index = descriptor;
+    interface->mac_api->mlme_req(interface->mac_api, MLME_SET, &set_req);
+    return 0;
 }
 
 void mac_helper_security_key_swap_next_to_default(protocol_interface_info_entry_t *interface)