usb: gadget: udc: core: Warn about failed to find udc
If we do not warn here, the user may not know failed to find udc device by a gadget driver with the same name because it silently fails. Let's print a warning in that case so developers find these problems faster. Signed-off-by: NDejin Zheng <zhengdejin5@gmail.com> Signed-off-by: NFelipe Balbi <balbi@kernel.org> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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