check errors in channels/api4/channel.go (#28376)

Co-authored-by: Ben Schumacher <ben.schumacher@mattermost.com>

server/.golangci.yml

@@ -61,7 +61,6 @@ issues:
       path: "\
         channels/api4/apitestlib.go|\
         channels/api4/bot_test.go|\
-        channels/api4/channel.go|\
         channels/api4/channel_test.go|\
         channels/api4/cloud.go|\
         channels/api4/cloud_test.go|\