usb: gadget: f_hid: Add missing error code

usb: gadget: f_hid: Add missing error code

Currently in cdev_alloc() error path no error code is assigned.

Assign error code '-ENOMEM'.

Detected by Smatch:
drivers/usb/gadget/function/f_hid.c:1291 hidg_bind()
warn: missing error code 'status'

Fixes: 81ebd43cc0d6d ("usb: gadget: f_hid: don't call cdev_init while cdev in use")
Signed-off-by: Ethan Tidmore <ethantidmore06@gmail.com>
Acked-by: Peter Korsgaard <peter@korsgaard.com>
Reviewed-by: Michael Zimmermann <sigmaepsilon92@gmail.com>
Link: https://patch.msgid.link/20260402180008.64233-1-ethantidmore06@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>