Staging: rtl8723bs: remove some dead code

"psecnetwork" is the address of &psecuritypriv->sec_bss.  Since
->sec_bss isn't the first member of the struct that means that
"psecnetwork" can't be NULL.

We can just remove this dead code.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>