virNetDevMacVLanCreateWithVPortProfile: Don't mask virNetDevMacVLanTapOpen error
https://bugzilla.redhat.com/show_bug.cgi?id=1240439 In this function we create a macvtap device and open its tap device. Possibly multiple times. Now the thing is, if opening the tap device fails, that is virNetDevMacVLanTapOpen() returns a negative value, we unroll all the changes BUT return 0 fooling caller into thinking everything went okay. Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
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