usb: Fixed a few typos

Fixed typos in comments of various drivers/usb files

Signed-off-by: Mickael Maison <mickael.maison@gmail.com>
Acked-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/usb/storage/scsiglue.c b/drivers/usb/storage/scsiglue.c
index 866b5df..0e400f3 100644
--- a/drivers/usb/storage/scsiglue.c
+++ b/drivers/usb/storage/scsiglue.c
@@ -241,7 +241,7 @@
 
 		/* Some USB cardreaders have trouble reading an sdcard's last
 		 * sector in a larger then 1 sector read, since the performance
-		 * impact is negible we set this flag for all USB disks */
+		 * impact is negligible we set this flag for all USB disks */
 		sdev->last_sector_bug = 1;
 
 		/* Enable last-sector hacks for single-target devices using