KVM test: Little bug fix in pci_hotplug.py

If command executed timeout, the return value of status could be None,
which is missed in judge statement:

if s:
   ...

Thanks Jason Wang for pointing this out.

Signed-off-by: Yolkfull Chow <yzhou@redhat.com>


git-svn-id: http://test.kernel.org/svn/autotest/trunk@3831 592f7852-d20e-0410-864c-8624ca9c26a4
1 file changed