Check f.Sync() errors before closing logfile

matterbridge.go

@@ -54,8 +54,9 @@ func main() {
 	// if logging to a file, ensure it is closed when the program terminates
 	defer func() {
 		if f, ok := rootLogger.Out.(*os.File); ok {
-			f.Sync()
+			if err := f.Sync(); err != nil {
-			f.Close()
+				f.Close()
+			}
 		}
 	}()