usb: gadget: f_midi: defaults buflen sizes to 512
512 is the value used by wMaxPacketSize, as specified by the USB Spec. This makes sure this driver uses, by default, the most optimal value for IN and OUT endpoint requests. Signed-off-by: NFelipe F. Tonello <eu@felipetonello.com> Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>
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