[media] rtl28xxu: move usb buffers to state
Buffer needed for USB control message is small so move it to state and get rid of alloc/free used for each control message. Signed-off-by: Antti Palosaari <crope@iki.fi> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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