usb-bus: fix no params
After commit 702f3e0f, the params is nerver NULL. It should check *params instead of params to determine whether the params is empty. Signed-off-by: NTeLeMan <geleman@gmail.com> Signed-off-by: NAurelien Jarno <aurelien@aurel32.net> Signed-off-by: NLuiz Capitulino <lcapitulino@redhat.com> (cherry picked from commit 98f22dc1)
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