Fix typing error in unit test

test/private.c

@@ -473,7 +473,7 @@ START_TEST(test_mask_data)
 
 	uint32_t mask = 0x61626364;
 	/* TODO: adapt test for big endian */
-	ck_assert((*(unsigned char *)mask) == 0x64u);
+	ck_assert((*(unsigned char *)&mask) == 0x64u);
 
 #if defined(USE_WEBSOCKET)
 	memset(in, 0, sizeof(in));