selftests/nolibc: print name instead of number for EOVERFLOW

EOVERFLOW will be used in the coming time64 syscalls support.
Signed-off-by: Zhangjin Wu <falcon@tinylab.org>
Reviewed-by: Thomas Weißschuh <linux@weissschuh.net>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

tools/testing/selftests/nolibc/nolibc-test.c

@@ -107,6 +107,7 @@ const char *errorname(int err)
 	CASE_ERR(EDOM);
 	CASE_ERR(ERANGE);
 	CASE_ERR(ENOSYS);
+	CASE_ERR(EOVERFLOW);
 	default:
 		return itoa(err);
 	}