Consolidate error codes for too big message size.

Current code is written to return -EINVAL when tailroom in the skb msg
would be exhausted precisely when it's time to nest, and return -EMSGSIZE
in all other "not enough space" conditions.

Reviewed-by: Wojciech Drewek <wojciech.drewek@intel.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Reviewed-by: Joe Damato <jdamato@fastly.com>
Signed-off-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
---
 net/devlink/region.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/devlink/region.c b/net/devlink/region.c
index 0a75a2fbd4d7..63fb297f6d67 100644
--- a/net/devlink/region.c
+++ b/net/devlink/region.c
@@ -77,7 +77,7 @@ static int devlink_nl_region_snapshot_id_put(struct sk_buff *msg,
 
 	snap_attr = nla_nest_start_noflag(msg, DEVLINK_ATTR_REGION_SNAPSHOT);
 	if (!snap_attr)
-		return -EINVAL;
+		return -EMSGSIZE;
 
 	err = nla_put_u32(msg, DEVLINK_ATTR_REGION_SNAPSHOT_ID, snapshot->id);
 	if (err)
@@ -102,7 +102,7 @@ static int devlink_nl_region_snapshots_id_put(struct sk_buff *msg,
 	snapshots_attr = nla_nest_start_noflag(msg,
 					       DEVLINK_ATTR_REGION_SNAPSHOTS);
 	if (!snapshots_attr)
-		return -EINVAL;
+		return -EMSGSIZE;
 
 	list_for_each_entry(snapshot, &region->snapshot_list, list) {
 		err = devlink_nl_region_snapshot_id_put(msg, devlink, snapshot);
-- 
2.46.0