staging: lustre: llite: removed uneeded return variables

Removed variables used only for return purposes and replaced them for
the return value itself. Found using Coccinelle's semantic patch:

@@
local idexpression ret;
expression e;
@@

-ret =
+return
     e;
-return ret;

Signed-off-by: Juliana Rodrigues <juliana.orod@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>