utime/utime06.c: cleanup

* Delete some useless comments.

* Delete some useless variable value.

* Test without fork().

* Some cleanup.

Signed-off-by: Zeng Linggang <zenglg.jy@cn.fujitsu.com>
Acked-by: Jan Stancek <jstancek@redhat.com>
utime/utime06.c: add EPERM and EROFS errno testes

Add EPERM and EROFS errno testes for utime(2).

Signed-off-by: Zeng Linggang <zenglg.jy@cn.fujitsu.com>
Signed-off-by: Cyril Hrubis <metan@ucw.cz>
Reviewed-by: Jan Stancek <jstancek@redhat.com>