fix: role test errcheck issues (#28545)

Co-authored-by: Mattermost Build <build@mattermost.com>

server/.golangci.yml

@@ -84,7 +84,9 @@ issues:
         channels/api4/preference_test.go|\
         channels/api4/reaction_test.go|\
         channels/api4/remote_cluster.go|\
-        channels/api4/role_test.go|\
+        channels/api4/role.go|\
+        channels/api4/saml.go|\
+        channels/api4/scheme.go|\
         channels/api4/scheme_test.go|\
         channels/api4/shared_channel.go|\
         channels/api4/status.go|\