staging: dgnc: remove useless variable 'ch_intr_modem'

The 'ch_intr_modem' variable was used only for increasing.
So the 'ch_intr_modem' 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

···
 			cls_copy_data_from_queue_to_uart(ch);
 		}
 
-		/* CTS/RTS change of state */
-		if (isr & UART_IIR_CTSRTS) {
-			ch->ch_intr_modem++;
-			/*
-			 * Don't need to do anything, the cls_parse_modem
-			 * below will grab the updated modem signals.
-			 */
-		}
-
 		/* Parse any modem signal changes */
 		cls_parse_modem(ch, readb(&ch->ch_cls_uart->msr));
 	}

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_modem;	/* Count of interrupts */
 	ulong		ch_intr_tx;	/* Count of interrupts */
 	ulong		ch_intr_rx;	/* Count of interrupts */
 

drivers/staging/dgnc/dgnc_neo.c

···
 			 * If we get here, this means the hardware is doing auto flow control.
 			 * Check to see whether RTS/DTR or CTS/DSR caused this interrupt.
 			 */
-			ch->ch_intr_modem++;
 			cause = readb(&ch->ch_neo_uart->mcr);
 			/* Which pin is doing auto flow? RTS or DTR? */
 			if ((cause & 0x4) == 0) {