Fix build warnings from the kernel test robot:
drivers/hsi/clients/cmt_speech.c:831: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
    * Block until pending data transfers have completed.
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: kernel test robot <lkp@intel.com>
Cc: Aditya Srivastava <yashsri421@gmail.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
        return r;
 }
 
-/**
+/*
  * Block until pending data transfers have completed.
  */
 static int cs_hsi_data_sync(struct cs_hsi_iface *hi)
                        r = -ERESTARTSYS;
                        goto out;
                }
-               /**
+               /*
                 * prepare_to_wait must be called with hi->lock held
                 * so that callbacks can check for waitqueue_active()
                 */