staging: rtl8712: r8712_register_cmd_alive(): Change return values

Change return values of r8712_register_cmd_alive from _SUCCESS and _FAIL
to 0 and -EINVAL.
Change the return type of this function from sint to int.
Modify its call site to check for 0 instead of _SUCCESS.

Signed-off-by: Nishka Dasgupta <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/rtl8712/rtl8712_cmd.c

···
 			break;
 		if (padapter->driver_stopped || padapter->surprise_removed)
 			break;
-		if (r8712_register_cmd_alive(padapter) != _SUCCESS)
+		if (r8712_register_cmd_alive(padapter))
 			continue;
 _next:
 		pcmd = r8712_dequeue_cmd(&pcmdpriv->cmd_queue);

drivers/staging/rtl8712/rtl871x_pwrctrl.c

···
  * will raise the cpwm to be greater than or equal to P2.
  * Calling Context: Passive
  * Return Value:
- * _SUCCESS: r8712_cmd_thread can issue cmds to firmware afterwards.
- * _FAIL: r8712_cmd_thread can not do anything.
+ * 0:	    r8712_cmd_thread can issue cmds to firmware afterwards.
+ * -EINVAL: r8712_cmd_thread can not do anything.
  */
-sint r8712_register_cmd_alive(struct _adapter *padapter)
+int r8712_register_cmd_alive(struct _adapter *padapter)
 {
-	uint res = _SUCCESS;
+	int res = 0;
 	struct pwrctrl_priv *pwrctrl = &padapter->pwrctrlpriv;
 
 	mutex_lock(&pwrctrl->mutex_lock);
 	register_task_alive(pwrctrl, CMD_ALIVE);
 	if (pwrctrl->cpwm < PS_STATE_S2) {
 		r8712_set_rpwm(padapter, PS_STATE_S3);
-		res = _FAIL;
+		res = -EINVAL;
 	}
 	mutex_unlock(&pwrctrl->mutex_lock);
 	return res;

drivers/staging/rtl8712/rtl871x_pwrctrl.h

···
 };
 
 void r8712_init_pwrctrl_priv(struct _adapter *adapter);
-sint r8712_register_cmd_alive(struct _adapter *padapter);
+int r8712_register_cmd_alive(struct _adapter *padapter);
 void r8712_unregister_cmd_alive(struct _adapter *padapter);
 void r8712_cpwm_int_hdl(struct _adapter *padapter,
 			struct reportpwrstate_parm *preportpwrstate);