dquot: cleanup dquot initialize routine

Get rid of the initialize 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_initialize helper to __dquot_initialize
and vfs_dq_init to dquot_initialize 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/truncate.c b/fs/ufs/truncate.c
index e5ef8a3..d3b6270 100644
--- a/fs/ufs/truncate.c
+++ b/fs/ufs/truncate.c
@@ -528,7 +528,7 @@
 	    attr->ia_size != i_size_read(inode)) {
 		loff_t old_i_size = inode->i_size;
 
-		vfs_dq_init(inode);
+		dquot_initialize(inode);
 
 		error = vmtruncate(inode, attr->ia_size);
 		if (error)