Merge \\"ueventd: only relabel devices if there\\'s a delta\\" am: 95428817

    /* If the node already exists update its SELinux label to handle cases when

     * it was created with the wrong context during coldboot procedure. */

    if (mknod(path, mode, dev) && (errno == EEXIST)) {

        if (lsetfilecon(path, secontext)) {

        char* fcon = nullptr;

        int rc = lgetfilecon(path, &fcon);

        if (rc < 0) {

            ERROR("Cannot get SELinux label on '%s' device (%s)\n",

                    path, strerror(errno));

            goto out;

        }

        bool different = strcmp(fcon, secontext) != 0;

        freecon(fcon);

        if (different && lsetfilecon(path, secontext)) {

            ERROR("Cannot set '%s' SELinux label on '%s' device (%s)\n",

                    secontext, path, strerror(errno));

        }

    }

out:

    chown(path, uid, -1);

    setegid(AID_ROOT);