staging: rtl8192e: Fix typo in rtl8192e

Fix spelling typo in comments within rtl8192e.

Signed-off-by: Masanari Iida <standby24x7@gmail.com>
Reviewed-by: James Cameron <quozl@laptop.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>