Fix misspellings of "system", "controller", "interrupt" and "necessary".

Fix the various misspellings of "system", controller", "interrupt" and
"[un]necessary".

Signed-off-by: Robert P. J. Day <rpjday@mindspring.com>
Signed-off-by: Adrian Bunk <bunk@kernel.org>
diff --git a/drivers/misc/sony-laptop.c b/drivers/misc/sony-laptop.c
index 1bfbb87..fc70fba 100644
--- a/drivers/misc/sony-laptop.c
+++ b/drivers/misc/sony-laptop.c
@@ -277,7 +277,7 @@
 static DECLARE_WORK(sony_laptop_release_key_work,
 		do_sony_laptop_release_key);
 
-/* forward event to the input subsytem */
+/* forward event to the input subsystem */
 static void sony_laptop_report_input_event(u8 event)
 {
 	struct input_dev *jog_dev = sony_laptop_input.jog_dev;