The "usb-storage" device might not have been compiled into the binary
(e.g. when compiling with "--without-default-devices"), so we have to
check first before using it.
Message-Id: <20230525081016.1870364-2-thuth@redhat.com> Reviewed-by: Ani Sinha <anisinha@redhat.com> Signed-off-by: Thomas Huth <thuth@redhat.com>