Add a return value to prf_t.allocate_bytes()

src/libstrongswan/crypto/prfs/mac_prf.c

@@ -42,7 +42,7 @@ METHOD(prf_t, get_bytes, bool,
 	return TRUE;
 }
 
-METHOD(prf_t, allocate_bytes, void,
+METHOD(prf_t, allocate_bytes, bool,
 	private_prf_t *this, chunk_t seed, chunk_t *chunk)
 {
 	if (!chunk)
@@ -54,6 +54,7 @@ METHOD(prf_t, allocate_bytes, void,
 		*chunk = chunk_alloc(this->mac->get_mac_size(this->mac));
 		this->mac->get_mac(this->mac, seed, chunk->ptr);
 	}
+	return TRUE;
 }
 
 METHOD(prf_t, get_block_size, size_t,

src/libstrongswan/crypto/prfs/prf.h

@@ -87,8 +87,10 @@ struct prf_t {
 	 *
 	 * @param seed		a chunk containing the seed for the next bytes
 	 * @param chunk		chunk which will hold generated bytes
+	 * @return			TRUE if bytes allocated and generated successfully
 	 */
-	void (*allocate_bytes) (prf_t *this, chunk_t seed, chunk_t *chunk);
+	__attribute__((warn_unused_result))
+	bool (*allocate_bytes) (prf_t *this, chunk_t seed, chunk_t *chunk);
 
 	/**
 	 * Get the block size of this prf_t object.