staging: lustre: lnet: selftest: mark expected switch fall-through

In preparation to enabling -Wimplicit-fallthrough, mark switch cases
where we are expecting to fall through.
Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lnet/selftest/conctl.c

@@ -151,6 +151,7 @@ lst_debug_ioctl(struct lstio_debug_args *args)
 
 	case LST_OPC_BATCHSRV:
 		client = 0;
+		/* fall through */
 	case LST_OPC_BATCHCLI:
 		if (!name)
 			goto out;