[PATCH] dm: return correct error codes from dm_table_add_target()

Return correct error codes from dm_table_add_target().  [Kevin Corry]

drivers/md/dm-table.c

@@ -591,7 +591,7 @@ int dm_table_add_target(struct dm_table *t, const char *type,
 	tgt->type = dm_get_target_type(type);
 	if (!tgt->type) {
 		tgt->error = "unknown target type";
-		return r;
+		return -EINVAL;
 	}
 
 	tgt->table = t;
@@ -604,6 +604,7 @@ int dm_table_add_target(struct dm_table *t, const char *type,
 	 */
 	if (!adjoin(t, tgt)) {
 		tgt->error = "Gap in table";
+		r = -EINVAL;
 		goto bad;
 	}