staging: r8188eu: voq_cnt is write-only

voq_cnt in struct xmit_priv is initialised, incremented and decremented
but never read. Remove voq_cnt and resulting dead code.
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Acked-by: Pavel Skripkin <paskripkin@gmail.com>
Tested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com> # Edimax N150
Link: https://lore.kernel.org/r/20230109212852.75612-5-martin@kaiser.cxSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/core/rtw_xmit.c

@@ -194,9 +194,6 @@ int _rtw_init_xmit_priv(struct xmit_priv *pxmitpriv, struct adapter *padapter)
 
 	pxmitpriv->txirp_cnt = 1;
 
-	/* per AC pending irp */
-	pxmitpriv->voq_cnt = 0;
-
 	pxmitpriv->ack_tx = false;
 	mutex_init(&pxmitpriv->ack_tx_mutex);
 	rtw_sctx_init(&pxmitpriv->ack_tx_ops, 0);

drivers/staging/r8188eu/include/rtw_xmit.h

@@ -282,8 +282,6 @@ struct	xmit_priv {
 				 * 1->vi, 2->be, 3->bk. */
 	u8		txirp_cnt;/*  */
 	struct tasklet_struct xmit_tasklet;
-	/* per AC pending irp */
-	int voq_cnt;
 	struct __queue free_xmitbuf_queue;
 	struct __queue pending_xmitbuf_queue;
 	u8 *pallocated_xmitbuf;

drivers/staging/r8188eu/os_dep/usb_ops_linux.c

@@ -42,9 +42,6 @@ static void usb_write_port_complete(struct urb *purb, struct pt_regs *regs)
 	struct xmit_priv	*pxmitpriv = &padapter->xmitpriv;
 
 	switch (pxmitbuf->flags) {
-	case VO_QUEUE_INX:
-		pxmitpriv->voq_cnt--;
-		break;
 	case HIGH_QUEUE_INX:
 		rtw_chk_hi_queue_cmd(padapter);
 		break;
@@ -106,7 +103,6 @@ u32 rtw_write_port(struct adapter *padapter, u32 addr, u32 cnt, u8 *wmem)
 
 	switch (addr) {
 	case VO_QUEUE_INX:
-		pxmitpriv->voq_cnt++;
 		pxmitbuf->flags = VO_QUEUE_INX;
 		break;
 	case VI_QUEUE_INX: