check loaded files before accessing them

src/tus_file.c

@@ -586,21 +586,21 @@ tus_file_add(struct VPFX(tus_server) *srv, int basefd, const char *filename)
 		goto err;
 	}
 
+	err = tus_file_disk_err(fdisk);
+	if (err != NULL) {
+		fprintf(stderr, "tus add %s: %s\n", filename, err);
+		goto err;
+	}
+
 	/*
 	 * we do not read in final concats because they do not need relevant
-	 * amounts of date for re-upload
+	 * amounts of data for re-upload
 	 */
 	if (fdisk->type == TUS_FINAL) {
 		fprintf(stderr, "tus add %s: is final\n", filename);
 		goto err;
 	}
 
-	err = tus_file_disk_err(fdisk);
-	if (err != NULL) {
-		fprintf(stderr, "tus add %s: %s\n", filename, err);
-		goto err;
-	}
-
 	if (fdisk->upload_expires < VTIM_real()) {
 		fprintf(stderr, "tus add %s: expired\n", filename);
 		goto err;