Add a return value to mac_t.set_key()

src/libstrongswan/crypto/mac.h

@@ -62,8 +62,10 @@ struct mac_t {
 	 * Any key length must be accepted.
 	 *
 	 * @param key		key to set
+	 * @return			TRUE if key set successfully
 	 */
-	void (*set_key) (mac_t *this, chunk_t key);
+	__attribute__((warn_unused_result))
+	bool (*set_key) (mac_t *this, chunk_t key);
 
 	/**
 	 * Destroys a mac_t object.

src/libstrongswan/crypto/prfs/mac_prf.c

@@ -68,8 +68,7 @@ METHOD(prf_t, get_key_size, size_t,
 METHOD(prf_t, set_key, bool,
 	private_prf_t *this, chunk_t key)
 {
-	this->mac->set_key(this->mac, key);
-	return TRUE;
+	return this->mac->set_key(this->mac, key);
 }
 
 METHOD(prf_t, destroy, void,

src/libstrongswan/crypto/signers/mac_signer.c

@@ -103,8 +103,7 @@ METHOD(signer_t, get_block_size, size_t,
 METHOD(signer_t, set_key, bool,
 	private_signer_t *this, chunk_t key)
 {
-	this->mac->set_key(this->mac, key);
-	return TRUE;
+	return this->mac->set_key(this->mac, key);
 }
 
 METHOD(signer_t, destroy, void,