Errcheck issues fixed (#28409)

Co-authored-by: Ibrahim Serdar Acikgoz <serdaracikgoz86@gmail.com>

server/.golangci.yml

@@ -79,7 +79,6 @@ issues:
         channels/api4/export_test.go|\
         channels/api4/file_test.go|\
         channels/api4/group_local.go|\
-        channels/api4/handlers_test.go|\
         channels/api4/import_test.go|\
         channels/api4/integration_action_test.go|\
         channels/api4/ip_filtering_test.go|\