staging/rtl8187se: Remove code without effect

The local variable u4bAcParam is never read/used after assignment,
thus we can remove the declaration, assignment and any related code.

-> the local variables u1bAIFS, eACI and pAcParam can also be removed.

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