Clean up SharedConnectivityManager on unbind.

mService is used by registerCallback as an indication of if the service is bound to. This was only being set to null when the service was unbound from the service side, not when unbound from the manager side.

Bug: 301296167
Test: atest -c android.net.wifi.sharedconnectivity.cts.app.SharedConnectivityManagerTest
Change-Id: I2ef94cf0489b41a48a4279fbe3f9041ae0271280
1 file changed