usb: musb: Remove an unnecessary NULL value

The NULL initialization of the pointers assigned by kzalloc() first is
not necessary, because if the kzalloc() failed, the pointers will be
assigned NULL, otherwise it works as usual. so remove it.
Signed-off-by: Ruan Jinjie <ruanjinjie@huawei.com>
Link: https://lore.kernel.org/r/20230804093253.91647-5-ruanjinjie@huawei.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/musb/musb_gadget.c

@@ -1130,7 +1130,7 @@ static int musb_gadget_disable(struct usb_ep *ep)
 struct usb_request *musb_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
 {
 	struct musb_ep		*musb_ep = to_musb_ep(ep);
-	struct musb_request	*request = NULL;
+	struct musb_request	*request;
 
 	request = kzalloc(sizeof *request, gfp_flags);
 	if (!request)