logging: Unregister osmo_fd before closing fd

Change-Id: I0754ac3110b63d2a380068010830af6c85b0a653
diff --git a/src/core/logging.c b/src/core/logging.c
index 938c65f..bcfe318 100644
--- a/src/core/logging.c
+++ b/src/core/logging.c
@@ -1327,12 +1327,12 @@
 		}
 		wq = target->tgt_file.wqueue;
 		if (wq) {
+			osmo_fd_unregister(&wq->bfd);
 			if (wq->bfd.fd >= 0) {
 				if (target->type == LOG_TGT_TYPE_FILE)
 					close(wq->bfd.fd);
 				wq->bfd.fd = -1;
 			}
-			osmo_fd_unregister(&wq->bfd);
 			osmo_wqueue_clear(wq);
 			talloc_free(wq);
 			target->tgt_file.wqueue = NULL;