kernel/syscalls/memfd_create: fix case2's tst_res argument

Signed-off-by: ouyangciyan <zintown@qq.com>
Reviewed-by: Cyril Hrubis <chrubis@suse.cz>
diff --git a/testcases/kernel/syscalls/memfd_create/memfd_create03.c b/testcases/kernel/syscalls/memfd_create/memfd_create03.c
index 0502a2d..16d1685 100644
--- a/testcases/kernel/syscalls/memfd_create/memfd_create03.c
+++ b/testcases/kernel/syscalls/memfd_create/memfd_create03.c
@@ -110,7 +110,7 @@
 		} else {
 			tst_res(TFAIL,
 				"munmap(%p, %dkB) suceeded unexpectedly\n",
-				mem, i);
+				mem, i/1024);
 			return;
 		}
 	}