Staging: comedi: comedi.h: fixed missing or malformed SPDX-License-Identifier

Fixed SPDX-License-Identifier comment on first line
Signed-off-by: ankit patel <ankit.mayurbhai.patel@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/comedi.h

-// SPDX-License-Identifier: LGPL-2.0+
+/* SPDX-License-Identifier: LGPL-2.0+ */
 /*
  * comedi.h
  * header file for COMEDI user API