staging: lustre: obdclass: change lu_site->ls_purge_start to unsigned

Change the type accordant usage.
Signed-off-by: Dmitry Eremin <dmitry.eremin@intel.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-5577
Reviewed-on: http://review.whamcloud.com/12384Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: James Simmons <uja.ornl@gmail.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/include/lu_object.h

@@ -602,7 +602,7 @@ struct lu_site {
 	/**
 	 * index of bucket on hash table while purging
 	 */
-	int		       ls_purge_start;
+	unsigned int		ls_purge_start;
 	/**
 	 * Top-level device for this stack.
 	 */

drivers/staging/lustre/lustre/obdclass/lu_object.c

@@ -338,7 +338,7 @@ int lu_site_purge(const struct lu_env *env, struct lu_site *s, int nr)
 	struct cfs_hash_bd	    bd2;
 	struct list_head	       dispose;
 	int		      did_sth;
-	int		      start;
+	unsigned int start;
 	int		      count;
 	int		      bnr;
 	unsigned int i;