Merge branch 'sg/lock-file-commit-error'

Cosmetic improvement to lock-file error messages.

* sg/lock-file-commit-error:
  Make error message after failing commit_lock_file() less confusing

fast-import.c

@@ -1824,7 +1824,7 @@ static void dump_marks(void)
 
 	dump_marks_helper(f, 0, marks);
 	if (commit_lock_file(&mark_lock)) {
-		failure |= error("Unable to commit marks file %s: %s",
+		failure |= error("Unable to write file %s: %s",
 			export_marks_file, strerror(errno));
 		return;
 	}