staging: rtl8712: r8712_os_recvbuf_resource_alloc(): Change return values

Change return values of r8712_os_recvbuf_resource_alloc from
_SUCCESS/_FAIL to 0/-ENOMEM respectively.
Modify check at call site to check for non-zero return value instead of
_FAIL. Thereafter remove variable at call site that stored the return
value and perform the check directly.
Signed-off-by: Nishka Dasgupta <nishkadg.linux@gmail.com>
Link: https://lore.kernel.org/r/20190802064212.30476-4-nishkadg.linux@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8712/recv_linux.c

@@ -40,12 +40,12 @@ void r8712_os_recv_resource_alloc(struct _adapter *padapter,
 int r8712_os_recvbuf_resource_alloc(struct _adapter *padapter,
 				    struct recv_buf *precvbuf)
 {
-	int res = _SUCCESS;
+	int res = 0;
 
 	precvbuf->irp_pending = false;
 	precvbuf->purb = usb_alloc_urb(0, GFP_KERNEL);
 	if (!precvbuf->purb)
-		res = _FAIL;
+		res = -ENOMEM;
 	precvbuf->pskb = NULL;
 	precvbuf->pallocated_buf = NULL;
 	precvbuf->pbuf = NULL;

drivers/staging/rtl8712/rtl8712_recv.c

@@ -39,7 +39,6 @@ void r8712_init_recv_priv(struct recv_priv *precvpriv, struct _adapter *padapter
 {
 	int i;
 	struct recv_buf *precvbuf;
-	int res = _SUCCESS;
 	addr_t tmpaddr = 0;
 	int alignment = 0;
 	struct sk_buff *pskb = NULL;
@@ -49,15 +48,14 @@ void r8712_init_recv_priv(struct recv_priv *precvpriv, struct _adapter *padapter
 	precvpriv->pallocated_recv_buf =
 		kzalloc(NR_RECVBUFF * sizeof(struct recv_buf) + 4, GFP_ATOMIC);
 	if (!precvpriv->pallocated_recv_buf)
-		return _FAIL;
+		return;
 	precvpriv->precv_buf = precvpriv->pallocated_recv_buf + 4 -
 			      ((addr_t)(precvpriv->pallocated_recv_buf) & 3);
 	precvbuf = (struct recv_buf *)precvpriv->precv_buf;
 	for (i = 0; i < NR_RECVBUFF; i++) {
 		INIT_LIST_HEAD(&precvbuf->list);
 		spin_lock_init(&precvbuf->recvbuf_lock);
-		res = r8712_os_recvbuf_resource_alloc(padapter, precvbuf);
-		if (res == _FAIL)
+		if (r8712_os_recvbuf_resource_alloc(padapter, precvbuf))
 			break;
 		precvbuf->ref_cnt = 0;
 		precvbuf->adapter = padapter;