staging: wlags49_h2: remove unneeded memset() in wireless_get_bssid()

A few lines after this call, we memcpy over the same memory area, so the call to
memset is not necessary.

Signed-off-by: Cyril Roelandt <tipecaml@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>