qemu: separate counting of USB controllers
qemuBuildLegacyUSBControllerCommandLine is the only place where we need to count the USB controllers. Count them again instead of keeping track in a variable passed to qemuBuildControllerDevStr. This removes the need for another variable in the loop in qemuBuildControllerDevCommandLine. Signed-off-by: NJán Tomko <jtomko@redhat.com> Reviewed-by: NCole Robinson <crobinso@redhat.com>
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