staging: rtl8712: fix the bssid in mp_start_test()

We recently moved "bssid" off the stack, and allocated it with kmalloc()
instead.  Unfortunately, this one line was overlooked so it will copy
random data into the &tgt_network->network instead of the data we want.

Fixes: 0b18e5fe ("staging: rtl8712: rtl871x_mp_ioctl: Move a large data struct onto the heap")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/YJ6IrfkbdaTHgpEv@mwanda


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>