staging: rtl8712: _r8712_init_xmit_priv(): Change return values and type

Change the return values in _r8712_init_xmit_priv from _SUCCESS/_FAIL to
0/-ENOMEM respectively. Change return type from sint to int.

Signed-off-by: Nishka Dasgupta <nishkadg.linux@gmail.com>
Link: https://lore.kernel.org/r/20190809052353.5308-1-nishkadg.linux@gmail.com


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