7a8d7af virsh: initialize str to NULL to solve a build issue

2 files Authored by Chen Hanxiao 10 years ago, Committed by Ján Tomko 10 years ago,
    virsh: initialize str to NULL to solve a build issue
    
    Fix a -Werror=maybe-uninitialized issue.
    
    Signed-off-by: Chen Hanxiao <chenhanxiao@cn.fujitsu.com>
    Signed-off-by: Ján Tomko <jtomko@redhat.com>
    
        
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