Spelling fix: explicitly

From: Jean Delvare <khali@linux-fr.org>

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Adrian Bunk <bunk@kernel.org>
diff --git a/drivers/input/mouse/psmouse-base.c b/drivers/input/mouse/psmouse-base.c
index da316d1..21a9c0b 100644
--- a/drivers/input/mouse/psmouse-base.c
+++ b/drivers/input/mouse/psmouse-base.c
@@ -906,7 +906,7 @@
 
 /*
  * psmouse_deactivate() puts the mouse into poll mode so that we don't get motion
- * reports from it unless we explicitely request it.
+ * reports from it unless we explicitly request it.
  */
 
 static void psmouse_deactivate(struct psmouse *psmouse)