Bluetooth: Mesh: Return a boolean from subnet_find callback

bt_mesh_subnet_find calls a callback for every subnet, and returns the
subnet that got a non-zero return code from the callback. As pointed out
in #41693, the callback should return a boolean, not an int.

Signed-off-by: Trond Einar Snekvik <Trond.Einar.Snekvik@nordicsemi.no>
5 files changed