autofs4: split autofs4_init_ino()

split init_ino into new_ino and clean_ino; the former is
what used to be init_ino(NULL, sbi), the latter is for cases
where we passed non-NULL ino.  Lose unused arguments.

Acked-by: Ian Kent <raven@themaw.net>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/autofs4/root.c b/fs/autofs4/root.c
index a5b93e8..f7c97c0 100644
--- a/fs/autofs4/root.c
+++ b/fs/autofs4/root.c
@@ -508,7 +508,7 @@
 		if (autofs_type_indirect(sbi->type) && IS_ROOT(dentry->d_parent))
 			__managed_dentry_set_managed(dentry);
 
-		ino = autofs4_init_ino(NULL, sbi);
+		ino = autofs4_new_ino(sbi);
 		if (!ino)
 			return ERR_PTR(-ENOMEM);
 
@@ -541,7 +541,7 @@
 
 	BUG_ON(!ino);
 
-	autofs4_init_ino(ino, sbi);
+	autofs4_clean_ino(ino);
 
 	autofs4_del_active(dentry);
 
@@ -732,7 +732,7 @@
 
 	BUG_ON(!ino);
 
-	autofs4_init_ino(ino, sbi);
+	autofs4_clean_ino(ino);
 
 	autofs4_del_active(dentry);