qemu: eliminate ret in qemuExtDevicesStart
All the callees return either 0 or -1 so there is no need for propagating the value. And we bail on the first error. Remove the variable to make the function simpler. Signed-off-by: NJán Tomko <jtomko@redhat.com> Reviewed-by: NPeter Krempa <pkrempa@redhat.com>
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