Fix up trivial spelling errors ('taht' -> 'that')

Pointed out by Lucas who found the new one in a comment in
setup_percpu.c. And then I fixed the others that I grepped
for.

Reported-by: Lucas <canolucas@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/usb/gadget/f_fs.c

@@ -136,7 +136,7 @@ struct ffs_data {
 	 * handling setup requests immidiatelly user space may be so
 	 * slow that another setup will be sent to the gadget but this
 	 * time not to us but another function and then there could be
-	 * a race.  Is taht the case? Or maybe we can use cdev->req
+	 * a race.  Is that the case? Or maybe we can use cdev->req
 	 * after all, maybe we just need some spinlock for that? */
 	struct usb_request		*ep0req;		/* P: mutex */
 	struct completion		ep0req_completion;	/* P: mutex */