Staging: rtl8192e: Remove unused variable

This patch removes a variable which has never been used. The following
Coccinelle semantic patch was used to make this transformation:

@@
type T;
identifier i;
constant C;
@@

- T i;
  <... when != i
- i = C;
  ...>

Signed-off-by: Mahati Chamarthy <mahati.chamarthy@gmail.com>
Acked-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>