Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/drivers/scsi/wd7000.c b/drivers/scsi/wd7000.c
index db451ae..9ee0afe 100644
--- a/drivers/scsi/wd7000.c
+++ b/drivers/scsi/wd7000.c
@@ -837,7 +837,7 @@
 		}
 	}
 
-	/* Take the lock, then check we didnt get beaten, if so try again */
+	/* Take the lock, then check we didn't get beaten, if so try again */
 	spin_lock_irqsave(&scbpool_lock, flags);
 	if (freescbs < needed) {
 		spin_unlock_irqrestore(&scbpool_lock, flags);