Merge "Check setegid() return values"

     * some device nodes, so the uid has to be set with chown() and is still

     * racy. Fixing the gid race at least fixed the issue with system_server

     * opening dynamic input devices under the AID_INPUT gid. */

    setegid(gid);

    if (setegid(gid)) {

        PLOG(ERROR) << "setegid(" << gid << ") for " << path << " device failed";

        goto out;

    }

    /* 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) && secontext) {

out:

    chown(path, uid, -1);

    setegid(AID_ROOT);

    if (setegid(AID_ROOT)) {

        PLOG(FATAL) << "setegid(AID_ROOT) failed";

    }

    if (secontext) {

        freecon(secontext);