staging: rtl8712: r8712_append_mpdu_unit(): Change return type

Change return type of r8712_append_mpdu_unit from u8 to void and remove
its return statement as it always returns only _SUCCESS. Modify call
sites to simply call this function instead of checking its return value,
and execute all the statements in the if-block for when the function
returns _SUCCESS.
Signed-off-by: Nishka Dasgupta <nishkadg.linux@gmail.com>
Link: https://lore.kernel.org/r/20190813044638.16348-2-nishkadg.linux@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8712/rtl8712_xmit.c

@@ -278,7 +278,7 @@ void r8712_construct_txaggr_cmd_hdr(struct xmit_buf *pxmitbuf)
 	pcmdpriv->cmd_seq++;
 }
 
-u8 r8712_append_mpdu_unit(struct xmit_buf *pxmitbuf,
+void r8712_append_mpdu_unit(struct xmit_buf *pxmitbuf,
 			    struct xmit_frame *pxmitframe)
 {
 	struct _adapter *padapter = pxmitframe->padapter;
@@ -315,8 +315,6 @@ u8 r8712_append_mpdu_unit(struct xmit_buf *pxmitbuf,
 		((ptx_desc->txdw0 & 0x0000ffff) +
 			((TXDESC_SIZE + last_txcmdsz + padding_sz) &
 			 0x0000ffff)));
-
-	return _SUCCESS;
 }
 
 
@@ -332,7 +330,7 @@ u8 r8712_xmitframe_aggr_1st(struct xmit_buf *pxmitbuf,
 	/*RTL8712_DMA_H2CCMD */
 	r8712_construct_txaggr_cmd_desc(pxmitbuf);
 	r8712_construct_txaggr_cmd_hdr(pxmitbuf);
-	if (r8712_append_mpdu_unit(pxmitbuf, pxmitframe) == _SUCCESS)
+	r8712_append_mpdu_unit(pxmitbuf, pxmitframe);
 	pxmitbuf->aggr_nr = 1;
 
 	return _SUCCESS;
@@ -347,11 +345,10 @@ u16 r8712_xmitframe_aggr_next(struct xmit_buf *pxmitbuf,
 	/* buffer addr assoc */
 	pxmitframe->buf_addr = pxmitbuf->pbuf + TXDESC_SIZE +
 		(((struct tx_desc *)pxmitbuf->pbuf)->txdw0 & 0x0000ffff);
-	if (r8712_append_mpdu_unit(pxmitbuf, pxmitframe) == _SUCCESS) {
+	r8712_append_mpdu_unit(pxmitbuf, pxmitframe);
 	r8712_free_xmitframe_ex(&pxmitframe->padapter->xmitpriv,
 				pxmitframe);
 	pxmitbuf->aggr_nr++;
-	}
 
 	return TXDESC_SIZE +
 		(((struct tx_desc *)pxmitbuf->pbuf)->txdw0 & 0x0000ffff);