[media] gspca - main: isoc mode devices are never low speed
Quoting from the official usb 20 spec:
"5.6.4 Isochronous Transfer Bus Access Constraints
Isochronous transfers can only be used by full-speed and high-speed devices."
This means that for code paths which are isoc mode only, we don't need to
check for the device being low speed, simplifying the code.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Jean-François Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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