Fix: emoji errcheck issues (#28437)

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

server/.golangci.yml

@@ -74,7 +74,6 @@ issues:
         channels/api4/config_local.go|\
         channels/api4/config_test.go|\
         channels/api4/data_retention.go|\
-        channels/api4/emoji.go|\
         channels/api4/emoji_test.go|\
         channels/api4/export.go|\
         channels/api4/export_test.go|\

server/channels/api4/emoji.go

@@ -33,7 +33,11 @@ func (api *API) InitEmoji() {
 }
 
 func createEmoji(c *Context, w http.ResponseWriter, r *http.Request) {
-	defer io.Copy(io.Discard, r.Body)
+	defer func() {
+		if _, err := io.Copy(io.Discard, r.Body); err != nil {
+			c.Logger.Warn("Error while discarding request body", mlog.Err(err))
+		}
+	}()
 
 	if !*c.App.Config().ServiceSettings.EnableCustomEmoji {
 		c.Err = model.NewAppError("createEmoji", "api.emoji.disabled.app_error", nil, "", http.StatusNotImplemented)
@@ -291,7 +295,9 @@ func getEmojiImage(c *Context, w http.ResponseWriter, r *http.Request) {
 
 	w.Header().Set("Content-Type", "image/"+imageType)
 	w.Header().Set("Cache-Control", "max-age=2592000, private")
-	w.Write(image)
+	if _, err := w.Write(image); err != nil {
+		c.Logger.Warn("Error while writing image response", mlog.Err(err))
+	}
 }
 
 func searchEmojis(c *Context, w http.ResponseWriter, r *http.Request) {