usb: gadget: udc: core: update usb_ep_queue() documentation

I agree with Alan that the spinlock must be dropped before calling usb_ep_queue. An example can be found in the ep0_queue function of the f_mass_storage driver.

Best,

Tuba Yavuz, Ph.D.
Assistant Professor
Electrical and Computer Engineering Department
University of Florida
Gainesville, FL 32611
Webpage: http://www.tuba.ece.ufl.edu/
Email: [email protected]
Phone: (352) 846 0202