virt: vbox: Use current_uid() in vbg_misc_device_requestor()

Modify vbg_misc_device_requestor() to use current_uid() wrapper.

Signed-off-by: Denis Efremov <efremov@linux.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20200824125330.487083-1-efremov@linux.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>