staging: wilc1000: refactor wilc_wlan_handle_isr_ext to avoid goto statement

Refactor wilc_wlan_handle_isr_ext() to avoid the use of the goto label.
Also avoid the unnecessary NULL check for 'wilc->rx_buffer' and
calling wilc_wlan_handle_rxq() only after wilc_wlan_rxq_add() call.
The link [1] contains details for discussion related to this changes.

[1]. https://patchwork.kernel.org/patch/10533601/Signed-off-by: Ajay Singh <ajay.kathat@microchip.com>
Suggested-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wilc1000/wilc_wlan.c

@@ -815,31 +815,28 @@ static void wilc_wlan_handle_isr_ext(struct wilc *wilc, u32 int_status)
 		retries++;
 	}
 
-	if (size > 0) {
+	if (size <= 0)
+		return;
+
 	if (LINUX_RX_SIZE - offset < size)
 		offset = 0;
 
-		if (wilc->rx_buffer)
 	buffer = &wilc->rx_buffer[offset];
-		else
-			goto end;
 
-		wilc->hif_func->hif_clear_int_ext(wilc,
-					      DATA_INT_CLR | ENABLE_RX_VMM);
+	wilc->hif_func->hif_clear_int_ext(wilc, DATA_INT_CLR | ENABLE_RX_VMM);
 	ret = wilc->hif_func->hif_block_rx_ext(wilc, 0, buffer, size);
+	if (!ret)
+		return;
 
-end:
-		if (ret) {
 	offset += size;
 	wilc->rx_buffer_offset = offset;
 	rqe = kmalloc(sizeof(*rqe), GFP_KERNEL);
-			if (rqe) {
+	if (!rqe)
+		return;
+
 	rqe->buffer = buffer;
 	rqe->buffer_size = size;
 	wilc_wlan_rxq_add(wilc, rqe);
-			}
-		}
-	}
 	wilc_wlan_handle_rxq(wilc);
 }