syscalls/chown01: Fix test file creation

There is a bug in the code to create the file and the code is
very intricate. So replace it with SAFE_FILE_PRINTF().

Signed-off-by: jungsoo.son <jungsoo.son@lge.com>
Reviewed-by: Jan Stancek <jstancek@redhat.com>
Signed-off-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>