staging/rtl8187se: Remove unused/unnecessary variables

The local variables priv and ieee are not used and thus can be removed.
The local variable u1bAIFS is not used/read after assignment and thus
can be removed.

Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>