usb: dwc3: core: don't forget to free coherent memory
commit 3921426b (usb: dwc3: core: move event buffer allocation out of dwc3_core_init()) introduced a memory leak of the coherent memory we use as event buffers on dwc3 driver. If the driver is compiled as a dynamically loadable module and use constantly loads and unloads the driver, we will continue to leak the coherent memory allocated during ->probe() because dwc3_free_event_buffers() is never called during ->remove(). Cc: <stable@vger.kernel.org> # v3.7 v3.8 Signed-off-by: Felipe Balbi <balbi@ti.com>
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