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/arch/h8300/kernel/irq.c b/arch/h8300/kernel/irq.c
index 43d21e9..8dec4dd 100644
--- a/arch/h8300/kernel/irq.c
+++ b/arch/h8300/kernel/irq.c
@@ -68,7 +68,7 @@
 }
 
 /*
- * h8300 interrupt controler implementation
+ * h8300 interrupt controller implementation
  */
 struct irq_chip h8300irq_chip = {
 	.name		= "H8300-INTC",