qemu: use g_autoptr for a virPCIDevice
qemu: use g_autoptr for a virPCIDevice

The one instance of a virPCIDevice in
qemuDomainDeviceCalculatePCIConnectFlags() needs to be converted to
use g_autoptr as a prerequisite for a bugfix. It's in this patch by
itself (rather than in a patch converting all virPCIDevice usages to
g_autoptr) to simplify any backport of said bugfix.

Signed-off-by: Laine Stump <c23361c43fbf79fed83e8b76173707b083d6caf5@redhat.com>
Reviewed-by: Michal Privoznik <83d82aaba2eed257f4814b0c239c260c4caaadf0@redhat.com>

jfehlig/libvirt,zippy2/libvirt,crobinso/libvirt,zippy2/libvirt,jfehlig/libvirt,jfehlig/libvirt,olafhering/libvirt,jfehlig/libvirt,libvirt/libvirt,nertpinx/libvirt,crobinso/libvirt,zippy2/libvirt,nertpinx/libvirt,libvirt/libvirt,libvirt/libvirt,nertpinx/libvirt,crobinso/libvirt,libvirt/libvirt,nertpinx/libvirt,olafhering/libvirt,olafhering/libvirt,nertpinx/libvirt,olafhering/libvirt,zippy2/libvirt,crobinso/libvirt