Revert "inet: fix addr_len/msg->msg_namelen assignment in recv_error and rxpmtu functions"

This reverts commit 160c4dacc181ea7e44f1bb19dede34d841dd82db.
Revert "ping: prevent NULL pointer dereference on write to msg_name"

This reverts commit 270ea2e953ebec51037b348a50a1b34bc83aabce.
Revert "inet: prevent leakage of uninitialized memory to user in recv syscalls"

This reverts commit db5533bae0503b47681e00fb3d32da7cf05c8a36.