misc: ioc4: Use ktime_get_ns()

Replace the ever recurring:
ts = ktime_get_ts();
ns = timespec_to_ns(&ts);
with
ns = ktime_get_ns();

Signed-off-by: Thomas Gleixner <[e-mail]>
Acked-by: Arnd Bergmann <[e-mail]>
Acked-by: Greg Kroah-Hartman <[e-mail]>
Signed-off-by: John Stultz <[e-mail]>

drivers/misc/ioc4.c

···
 	union ioc4_int_out int_out;
 	union ioc4_gpcr gpcr;
 	unsigned int state, last_state = 1;
-	struct timespec start_ts, end_ts;
 	uint64_t start, end, period;
 	unsigned int count = 0;
 
···
 		if (!last_state && state) {
 			count++;
 			if (count == IOC4_CALIBRATE_END) {
-				ktime_get_ts(&end_ts);
+				end = ktime_get_ns();
 				break;
 			} else if (count == IOC4_CALIBRATE_DISCARD)
-				ktime_get_ts(&start_ts);
+				start = ktime_get_ns();
 		}
 		last_state = state;
 	} while (1);
···
 	 *    by which the IOC4 generates the square wave, to get the
 	 *    period of an IOC4 INT_OUT count.
 	 */
-	end = end_ts.tv_sec * NSEC_PER_SEC + end_ts.tv_nsec;
-	start = start_ts.tv_sec * NSEC_PER_SEC + start_ts.tv_nsec;
 	period = (end - start) /
 		(IOC4_CALIBRATE_CYCLES * 2 * (IOC4_CALIBRATE_COUNT + 1));