copy.c: use error_errno()

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

copy.c

@@ -42,15 +42,15 @@ int copy_file(const char *dst, const char *src, int mode)
 	status = copy_fd(fdi, fdo);
 	switch (status) {
 	case COPY_READ_ERROR:
-		error("copy-fd: read returned %s", strerror(errno));
+		error_errno("copy-fd: read returned");
 		break;
 	case COPY_WRITE_ERROR:
-		error("copy-fd: write returned %s", strerror(errno));
+		error_errno("copy-fd: write returned");
 		break;
 	}
 	close(fdi);
 	if (close(fdo) != 0)
-		return error("%s: close error: %s", dst, strerror(errno));
+		return error_errno("%s: close error", dst);
 
 	if (!status && adjust_shared_perm(dst))
 		return -1;