errcheck issues fixed (#28476)

server/.golangci.yml

@@ -98,7 +98,6 @@ issues:
         channels/api4/permission.go|\
         channels/api4/plugin.go|\
         channels/api4/plugin_test.go|\
-        channels/api4/post.go|\
         channels/api4/post_test.go|\
         channels/api4/preference_test.go|\
         channels/api4/reaction.go|\

server/channels/api4/post.go

@@ -1127,7 +1127,9 @@ func acknowledgePost(c *Context, w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	w.Write(js)
+	if _, err := w.Write(js); err != nil {
+		c.Logger.Warn("Error while writing response", mlog.Err(err))
+	}
 }
 
 func unacknowledgePost(c *Context, w http.ResponseWriter, r *http.Request) {
@@ -1284,7 +1286,9 @@ func getFileInfosForPost(c *Context, w http.ResponseWriter, r *http.Request) {
 
 	w.Header().Set("Cache-Control", "max-age=2592000, private")
 	w.Header().Set(model.HeaderEtagServer, model.GetEtagForFileInfos(infos))
-	w.Write(js)
+	if _, err := w.Write(js); err != nil {
+		c.Logger.Warn("Error while writing response", mlog.Err(err))
+	}
 }
 
 func getPostInfo(c *Context, w http.ResponseWriter, r *http.Request) {
@@ -1305,7 +1309,9 @@ func getPostInfo(c *Context, w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	w.Write(js)
+	if _, err := w.Write(js); err != nil {
+		c.Logger.Warn("Error while writing response", mlog.Err(err))
+	}
 }
 
 func hasPermittedWranglerRole(c *Context, user *model.User, channelMember *model.ChannelMember) bool {