staging: lustre: lmv: access lum_stripe_offset as little endian

By the time that a struct lmv_user_md reaches lmv_placement_policy()
it has already been converted to little endian. Therefore use the
appropriate macros around accesses to this this field. This issue was
found by rewriting the definition of struct lmv_user_md to use the
__leXX typedefs and running sparse.
Signed-off-by: John L. Hammond <john.hammond@intel.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-4738
Reviewed-on: http://review.whamcloud.com/9671Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-by: Swapnil Pimpale <spimpale@ddn.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/lmv/lmv_obd.c

@@ -1242,15 +1242,15 @@ static int lmv_placement_policy(struct obd_device *obd,
 		struct lmv_user_md *lum;
 
 		lum = op_data->op_data;
-		if (lum->lum_stripe_offset != (__u32)-1) {
-			*mds = lum->lum_stripe_offset;
+		if (le32_to_cpu(lum->lum_stripe_offset) != (__u32)-1) {
+			*mds = le32_to_cpu(lum->lum_stripe_offset);
 		} else {
 			/*
 			 * -1 means default, which will be in the same MDT with
 			 * the stripe
 			 */
 			*mds = op_data->op_mds;
-			lum->lum_stripe_offset = op_data->op_mds;
+			lum->lum_stripe_offset = cpu_to_le32(op_data->op_mds);
 		}
 	} else {
 		/*