[libvirt] odd message from latest libvirt.git

[Eric Blake]

# ./run daemon/libvirtd
2014-07-01 04:27:19.913+0000: 1160: info : libvirt version: 1.2.6
2014-07-01 04:27:19.913+0000: 1160: error : virFileReadAll:1297 : Failed
to read file '/sys/class/net/wlp3s0/speed': Invalid argument

This is probably a kernel bug in Fedora 20; but we shouldn't be
polluting the logs just because of the kernel being unable to read a
file that it claims exists:

# ls -l /sys/class/net/wlp3s0/speed
-r--r--r--. 1 root root 4096 Jun 28 07:41 /sys/class/net/wlp3s0/speed
# cat /sys/class/net/wlp3s0/speed
cat: /sys/class/net/wlp3s0/speed: Invalid argument

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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