[media] em28xx-audio: allocate URBs at device driver init
Instead of allocating/deallocating URBs and transfer buffers every time stream is started/stopped, just do it once. That reduces the memory allocation pressure and makes the code that start/stop streaming a way simpler. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com> Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
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