trivial: fix typo "varaible" -> "variable"

This patch was created by

	git grep -l '[vV]araible' | xargs -r -t perl -p -i -e 's/\b([Vv]ar)ai(bles?)\b/$1ia$2/g'

Signed-off-by: Uwe Kleine-Koenig <Uwe.Kleine-Koenig@digi.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/input/mouse/gpio_mouse.c b/drivers/input/mouse/gpio_mouse.c
index 0db8d16..5e5eb88 100644
--- a/drivers/input/mouse/gpio_mouse.c
+++ b/drivers/input/mouse/gpio_mouse.c
@@ -18,7 +18,7 @@
 
 /*
  * Timer function which is run every scan_ms ms when the device is opened.
- * The dev input varaible is set to the the input_dev pointer.
+ * The dev input variable is set to the the input_dev pointer.
  */
 static void gpio_mouse_scan(struct input_polled_dev *dev)
 {