[Libvir] [PATCH] check the file name for --log

[Atsushi SAKAI]

Hi,

This patch fixes the trouble if execute virsh with 
virsh --log --debug.
In this case FILE "--debug" is generated and 
--debug is off. 

This patch treat as error return 
if it uses the hyphen "-" at the head of log file name.

Signed-off-by: Atsushi SAKAI <sakaia at jp.fujitsu.com>

Thanks
Atsushi SAKAI
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