USB: usb-storage: Unusual_dev update

The protocol in this entry is needed for some versions of the device but
not others. This adds the NEED_OVERRIDE flag to prevent it complaining
to users who don't need it.
Signed-off-by: NPhil Dibowitz <phil@ipom.com>

drivers/usb/storage/unusual_devs.h

@@ -1236,7 +1236,7 @@ UNUSUAL_DEV( 0x0e21, 0x0520, 0x0100, 0x0100,
 		"Cowon Systems",
 		"iAUDIO M5",
 		US_SC_DEVICE, US_PR_BULK, NULL,
-		0 ),
+		US_FL_NEED_OVERRIDE ),
 
 /* Submitted by Antoine Mairesse <antoine.mairesse@free.fr> */
 UNUSUAL_DEV( 0x0ed1, 0x6660, 0x0100, 0x0300,