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H A Dhcd-musb.ca9be7657 Mon Nov 17 04:57:23 CST 2014 Paolo Bonzini <pbonzini@redhat.com> hcd-musb: fix dereference null return value

usb_ep_get and usb_handle_packet can deal with a NULL device, but we have
to avoid dereferencing NULL pointers when building the id.

Thanks to Gonglei for an initial stab at fixing this.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>