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/scsi/megaraid/megaraid_mbox.c b/drivers/scsi/megaraid/megaraid_mbox.c
index e4e4c6a..7877920 100644
--- a/drivers/scsi/megaraid/megaraid_mbox.c
+++ b/drivers/scsi/megaraid/megaraid_mbox.c
@@ -427,7 +427,7 @@
  * @id		: pci device id of the class of controllers
  *
  * This routine should be called whenever a new adapter is detected by the
- * PCI hotplug susbsytem.
+ * PCI hotplug susbsystem.
  */
 static int __devinit
 megaraid_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)