iio: st_sensors: fix typo in comment

s/timetamping/timestamping/

Cc: trivial@kernel.org
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Link: https://lore.kernel.org/r/20210121153945.5499-1-a.fatoum@pengutronix.deSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/common/st_sensors/st_sensors_buffer.c

@@ -57,7 +57,7 @@ irqreturn_t st_sensors_trigger_handler(int irq, void *p)
 	s64 timestamp;
 
 	/*
-	 * If we do timetamping here, do it before reading the values, because
+	 * If we do timestamping here, do it before reading the values, because
 	 * once we've read the values, new interrupts can occur (when using
 	 * the hardware trigger) and the hw_timestamp may get updated.
 	 * By storing it in a local variable first, we are safe.