vt: vt_ioctl: use msecs_to_jiffies for time conversion

Converting milliseconds to jiffies by "val * HZ / 1000" is technically
OK but msecs_to_jiffies(val) is the cleaner solution and handles all
corner cases correctly. This is a minor API consolidation only and
should make things more readable.
Signed-off-by: NNicholas Mc Guire <hofrat@osadl.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/vt/vt_ioctl.c

@@ -388,7 +388,7 @@ int vt_ioctl(struct tty_struct *tty,
 		 * Generate the tone for the appropriate number of ticks.
 		 * If the time is zero, turn off sound ourselves.
 		 */
-		ticks = HZ * ((arg >> 16) & 0xffff) / 1000;
+		ticks = msecs_to_jiffies((arg >> 16) & 0xffff);
 		count = ticks ? (arg & 0xffff) : 0;
 		if (count)
 			count = PIT_TICK_RATE / count;