Add a return value to signer_t.set_key()

src/libstrongswan/crypto/signers/mac_signer.c

@@ -101,10 +101,11 @@ METHOD(signer_t, get_block_size, size_t,
 	return this->truncation;
 }
 
-METHOD(signer_t, set_key, void,
+METHOD(signer_t, set_key, bool,
 	private_signer_t *this, chunk_t key)
 {
 	this->mac->set_key(this->mac, key);
+	return TRUE;
 }
 
 METHOD(signer_t, destroy, void,

src/libstrongswan/crypto/signers/signer.h

@@ -140,8 +140,10 @@ struct signer_t {
 	 * Set the key for this object.
 	 *
 	 * @param key		key to set
+	 * @return			TRUE if key set
 	 */
-	void (*set_key) (signer_t *this, chunk_t key);
+	__attribute__((warn_unused_result))
+	bool (*set_key) (signer_t *this, chunk_t key);
 
 	/**
 	 * Destroys a signer_t object.