staging: dgnc: remove useless variable 'ch_intr_rx'

The 'ch_intr_rx' variable was used only for increasing.
So the 'ch_intr_rx' variable is not useful for this driver.

Signed-off-by: Daeseok Youn <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/dgnc/dgnc_cls.c

···
 		/* Receive Interrupt pending */
 		if (isr & (UART_IIR_RDI | UART_IIR_RDI_TIMEOUT)) {
 			/* Read data from uart -> queue */
-			ch->ch_intr_rx++;
 			cls_copy_data_from_uart_to_queue(ch);
 			dgnc_check_queue_flow_control(ch);
 		}

drivers/staging/dgnc/dgnc_driver.h

···
 	ulong		ch_xon_sends;	/* Count of xons transmitted */
 	ulong		ch_xoff_sends;	/* Count of xoffs transmitted */
 
-	ulong		ch_intr_rx;	/* Count of interrupts */
-
 	/* /proc/<board>/<channel> entries */
 	struct proc_dir_entry *proc_entry_pointer;
 	struct dgnc_proc_entry *dgnc_channel_table;

drivers/staging/dgnc/dgnc_neo.c

···
 
 		if (isr & (UART_17158_IIR_RDI_TIMEOUT | UART_IIR_RDI)) {
 			/* Read data from uart -> queue */
-			ch->ch_intr_rx++;
 			neo_copy_data_from_uart_to_queue(ch);
 
 			/* Call our tty layer to enforce queue flow control if needed. */
···
 	ch->ch_cached_lsr |= linestatus;
 
 	if (ch->ch_cached_lsr & UART_LSR_DR) {
-		ch->ch_intr_rx++;
 		/* Read data from uart -> queue */
 		neo_copy_data_from_uart_to_queue(ch);
 		spin_lock_irqsave(&ch->ch_lock, flags);