unifying: Do not poll when we're waiting for device replug
unifying: Do not poll when we're waiting for device replug

If we happen to poll when the device is in the *process* of closing then the
open() fails in a weird way. If we're flashing it's probably a good idea to not
be too clever anyway...

fwupd/fwupd,hughsie/fwupd,vathpela/fwupd,hughsie/fwupd,superm1/fwupd,fwupd/fwupd,vathpela/fwupd,vathpela/fwupd,hughsie/fwupd,hughsie/fwupd,fwupd/fwupd,superm1/fwupd,vathpela/fwupd,superm1/fwupd,fwupd/fwupd