Update src/offlinelogstorage/dlt_offline_logstorage_behavior.c

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: minminlittleshrimp

src/offlinelogstorage/dlt_offline_logstorage_behavior.c

@@ -1115,10 +1115,14 @@ int dlt_logstorage_prepare_on_msg(DltLogStorageFilterConfig *config,
                         }
                     }
                     else {
-                        if (fsync(config->fd) != 0) {
-                            if (errno != ENOSYS) {
-                                dlt_vlog(LOG_ERR, "%s: failed to sync log file\n", __func__);
+                        if (config->fd != -1) {
+                            if (fsync(config->fd) != 0) {
+                                if (errno != ENOSYS) {
+                                    dlt_vlog(LOG_ERR, "%s: failed to sync log file\n", __func__);
+                                }
                             }
+                        } else {
+                            dlt_vlog(LOG_ERR, "%s: invalid file descriptor for log file sync\n", __func__);
                         }
                     }
                 }