Add a return value to prf_t.set_key()

src/libstrongswan/crypto/prfs/mac_prf.c

@@ -70,10 +70,11 @@ METHOD(prf_t, get_key_size, size_t,
 	return this->mac->get_mac_size(this->mac);
 }
 
-METHOD(prf_t, set_key, void,
+METHOD(prf_t, set_key, bool,
 	private_prf_t *this, chunk_t key)
 {
 	this->mac->set_key(this->mac, key);
+	return TRUE;
 }
 
 METHOD(prf_t, destroy, void,

src/libstrongswan/crypto/prfs/prf.h

@@ -113,8 +113,10 @@ struct prf_t {
 	 * Set the key for this prf_t object.
 	 *
 	 * @param key		key to set
+	 * @return			TRUE if key set successfully
 	 */
-	void (*set_key) (prf_t *this, chunk_t key);
+	__attribute__((warn_unused_result))
+	bool (*set_key) (prf_t *this, chunk_t key);
 
 	/**
 	 * Destroys a prf object.