dquot: cleanup dquot drop routine

Get rid of the drop dquot operation - it is now always called from
the filesystem and if a filesystem really needs it's own (which none
currently does) it can just call into it's own routine directly.

Rename the now static low-level dquot_drop helper to __dquot_drop
and vfs_dq_drop to dquot_drop to have a consistent namespace.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
diff --git a/fs/ufs/ialloc.c b/fs/ufs/ialloc.c
index 02f7788..67b4bdb 100644
--- a/fs/ufs/ialloc.c
+++ b/fs/ufs/ialloc.c
@@ -96,7 +96,7 @@
 	is_directory = S_ISDIR(inode->i_mode);
 
 	dquot_free_inode(inode);
-	vfs_dq_drop(inode);
+	dquot_drop(inode);
 
 	clear_inode (inode);
 
@@ -358,7 +358,7 @@
 	vfs_dq_init(inode);
 	err = dquot_alloc_inode(inode);
 	if (err) {
-		vfs_dq_drop(inode);
+		dquot_drop(inode);
 		goto fail_without_unlock;
 	}