Fix NativeCrashListener

In the move from InetUnixAddress to UnixSocketAddress
commit e9d53750 did not modify
the Os.accept() call in NativeCrashListener. It was passing
an empty InetSocketAddress.

The type could have been changed, but the peer address is
never used and it is safe to pass a null.

Bug: 3106438
Change-Id: I2a61221c4504657b3e1de848b0b493f202726126