mei: use type struct mei_cl *cl instead of void in struct mei_cb

We can use correct type 'struct mei_cl' instead of
'void *' for file_private in the struct mei_cb
as there is no other type assigned to this member of the structure

We rename the member from file_private to cl

Remove about 10 lines of declarations of temporary variables
used for type casting

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/misc/mei/iorw.c b/drivers/misc/mei/iorw.c
index a1d9ba1..cc53ce7 100644
--- a/drivers/misc/mei/iorw.c
+++ b/drivers/misc/mei/iorw.c
@@ -71,7 +71,7 @@
 	mei_io_list_init(cb);
 
 	cb->file_object = fp;
-	cb->file_private = cl;
+	cb->cl = cl;
 	cb->buf_idx = 0;
 	return cb;
 }