usb: gadget: udc: add return value check of kzalloc in mv_udc_probe

Even an 8-byte kzalloc will fail when we don't have enough memory,
so we need a nullptr check and do the cleanup when it fails.

Reported-by: eriri <1527030098@qq.com>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=217081


Signed-off-by: Kang Chen <void0red@gmail.com>
Link: https://lore.kernel.org/r/20230225041149.136-1-void0red@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>