Add a return value to aead_t.encrypt()

src/libstrongswan/crypto/aead.h

@@ -45,8 +45,10 @@ struct aead_t {
 	 * @param assoc			associated data to sign
 	 * @param iv			initialization vector
 	 * @param encrypted		allocated encryption result
+	 * @return				TRUE if successfully encrypted
 	 */
-	void (*encrypt)(aead_t *this, chunk_t plain, chunk_t assoc, chunk_t iv,
+	__attribute__((warn_unused_result))
+	bool (*encrypt)(aead_t *this, chunk_t plain, chunk_t assoc, chunk_t iv,
 					chunk_t *encrypted);
 
 	/**