staging/lustre: Remove unused cp_error from struct cl_page

cp_error member is not really set anywhere, so kill
it and the only printing user of it too.
Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/include/cl_object.h

@@ -701,8 +701,6 @@ enum cl_page_type {
 struct cl_page {
 	/** Reference counter. */
 	atomic_t	     cp_ref;
-	/** Transfer error. */
-	int			 cp_error;
 	/** An object this page is a part of. Immutable after creation. */
 	struct cl_object	*cp_obj;
 	/** vmpage */

drivers/staging/lustre/lustre/obdclass/cl_page.c

@@ -981,9 +981,9 @@ void cl_page_header_print(const struct lu_env *env, void *cookie,
 			  lu_printer_t printer, const struct cl_page *pg)
 {
 	(*printer)(env, cookie,
-		   "page@%p[%d %p %d %d %d %p %p]\n",
+		   "page@%p[%d %p %d %d %p %p]\n",
 		   pg, atomic_read(&pg->cp_ref), pg->cp_obj,
-		   pg->cp_state, pg->cp_error, pg->cp_type,
+		   pg->cp_state, pg->cp_type,
 		   pg->cp_owner, pg->cp_req);
 }
 EXPORT_SYMBOL(cl_page_header_print);