Added the code that handles the result code of a request.

src/common/capwap_element_resultcode.h

@@ -28,7 +28,9 @@
 #define CAPWAP_RESULTCODE_FAILURE_UNRECOGNIZED_MESSAGE_ELEMENT		21
 #define CAPWAP_RESULTCODE_DATA_TRANSFER_ERROR						22
 #define CAPWAP_RESULTCODE_LAST										22
-      
+
+#define CAPWAP_RESULTCODE_OK(x)						(((x) == CAPWAP_RESULTCODE_SUCCESS) || ((x) == CAPWAP_RESULTCODE_SUCCESS_NAT_DETECTED))
+
 struct capwap_resultcode_element {
 	uint32_t code;
 };