p2p_supplicant: ensure go_dev_addr is init'ed

The static analyzer complains that this function may occasionally exit
while leaving go_dev_addr uninitialized. Since we use it even if this
function exits 'unsuccessfully', we should ensure this has consistent
bits.

Bug: 206470603
Test: TH
Change-Id: I320218643c603549840d805c47c109b503e9127d
1 file changed