[patch] setfiles bugfix

[Yuichi Nakamura]

This patch fixes bug in setfiles.
setfiles segfaults in p[0] = '\0'.

-- 
Yuichi Nakamura
Hitachi Software Engineering Co., Ltd.
Japan SELinux Users Group(JSELUG): http://www.selinux.gr.jp/
SELinux Policy Editor: http://seedit.sourceforge.net/
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