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/aacraid/aacraid.h b/drivers/scsi/aacraid/aacraid.h
index 03b5102..9abba8b 100644
--- a/drivers/scsi/aacraid/aacraid.h
+++ b/drivers/scsi/aacraid/aacraid.h
@@ -1526,7 +1526,7 @@
 	__le32			capacityhigh;
 };
 
-#define FSCS_NOTCLEAN	0x0001  /* fsck is neccessary before mounting */
+#define FSCS_NOTCLEAN	0x0001  /* fsck is necessary before mounting */
 #define FSCS_READONLY	0x0002	/* possible result of broken mirror */
 #define FSCS_HIDDEN	0x0004	/* should be ignored - set during a clear */