erofs: remove unused tag argument while finding a workgroup

It is feasible to simplify erofs_find_workgroup() interface by removing
an unused function argument. While formally the argument is used in the
function itself, its assigned value is ignored on the caller side.

Signed-off-by: Vladimir Zapolskiy <vladimir@tuxera.com>
Link: https://lore.kernel.org/r/20200102120118.14979-2-vladimir@tuxera.com
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
diff --git a/fs/erofs/utils.c b/fs/erofs/utils.c
index 1e8e145..4d1cf4d 100644
--- a/fs/erofs/utils.c
+++ b/fs/erofs/utils.c
@@ -59,7 +59,7 @@ static int erofs_workgroup_get(struct erofs_workgroup *grp)
 }
 
 struct erofs_workgroup *erofs_find_workgroup(struct super_block *sb,
-					     pgoff_t index, bool *tag)
+					     pgoff_t index)
 {
 	struct erofs_sb_info *sbi = EROFS_SB(sb);
 	struct erofs_workgroup *grp;
@@ -68,7 +68,6 @@ struct erofs_workgroup *erofs_find_workgroup(struct super_block *sb,
 	rcu_read_lock();
 	grp = radix_tree_lookup(&sbi->workstn_tree, index);
 	if (grp) {
-		*tag = xa_pointer_tag(grp);
 		grp = xa_untag_pointer(grp);
 
 		if (erofs_workgroup_get(grp)) {