Get rid of non-OCF error codes

Let's put an end to random crashes and vague error messages in pyocf!

Signed-off-by: Michal Mielewczyk <michal.mielewczyk@huawei.com>

src/mngt/ocf_mngt_core.c

@@ -54,10 +54,10 @@ static int _ocf_uuid_set(const struct ocf_volume_uuid *uuid,
 	int result;
 
 	if (!uuid->data)
-		return -EINVAL;
+		return -OCF_ERR_INVAL;
 
 	if (uuid->size > sizeof(muuid->data))
-		return -ENOBUFS;
+		return -OCF_ERR_INVAL;
 
 	result = env_memcpy(muuid->data, sizeof(muuid->data),
 			uuid->data, uuid->size);