staging: dgnc: delete dgnc_utils.c

There was just one function in it, and it duplicated what
msleep_interruptable() was doing, which is pointless, so delete it and
fix up the one calling site.

Cc: Lidza Louina <lidza.louina@gmail.com>
Cc: Mark Hounschell <markh@compro.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/dgnc/Makefile

@@ -2,4 +2,4 @@ obj-$(CONFIG_DGNC) += dgnc.o
 
 dgnc-objs :=   dgnc_cls.o dgnc_driver.o\
                dgnc_mgmt.o dgnc_neo.o\
-               dgnc_tty.o dgnc_utils.o
+               dgnc_tty.o

drivers/staging/dgnc/dgnc_tty.c

@@ -26,7 +26,6 @@
 #include "dgnc_tty.h"
 #include "dgnc_neo.h"
 #include "dgnc_cls.h"
-#include "dgnc_utils.h"
 
 /* Default transparent print information. */
 
@@ -1229,7 +1228,7 @@ static void dgnc_tty_close(struct tty_struct *tty, struct file *file)
 			if (ch->ch_close_delay) {
 				spin_unlock_irqrestore(&ch->ch_lock,
 						       flags);
-				dgnc_ms_sleep(ch->ch_close_delay);
+				msleep_interruptible(ch->ch_close_delay);
 				spin_lock_irqsave(&ch->ch_lock, flags);
 			}
 		}

drivers/staging/dgnc/dgnc_utils.c

-// SPDX-License-Identifier: GPL-2.0
-#include <linux/tty.h>
-#include <linux/sched/signal.h>
-#include "dgnc_utils.h"
-
-/**
- * dgnc_ms_sleep - Put the driver to sleep
- * @ms - milliseconds to sleep
- *
- * Return: 0 if timed out, if interrupted by a signal return signal.
- */
-int dgnc_ms_sleep(ulong ms)
-{
-	__set_current_state(TASK_INTERRUPTIBLE);
-	schedule_timeout((ms * HZ) / 1000);
-	return signal_pending(current);
-}

drivers/staging/dgnc/dgnc_utils.h

-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _DGNC_UTILS_H
-#define _DGNC_UTILS_H
-
-int dgnc_ms_sleep(ulong ms);
-
-#endif	/* _DGNC_UTILS_H */