dquot: cleanup inode allocation / freeing routines

Get rid of the alloc_inode and free_inode dquot operations - they are
always called from the filesystem and if a filesystem really needs
their own (which none currently does) it can just call into it's
own routine directly.

Also get rid of the vfs_dq_alloc/vfs_dq_free wrappers and always
call the lowlevel dquot_alloc_inode / dqout_free_inode routines
directly, which now lose the number argument which is always 1.

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 3527c00..02f7788 100644
--- a/fs/ufs/ialloc.c
+++ b/fs/ufs/ialloc.c
@@ -95,7 +95,7 @@
 
 	is_directory = S_ISDIR(inode->i_mode);
 
-	vfs_dq_free_inode(inode);
+	dquot_free_inode(inode);
 	vfs_dq_drop(inode);
 
 	clear_inode (inode);
@@ -355,9 +355,10 @@
 
 	unlock_super (sb);
 
-	if (vfs_dq_alloc_inode(inode)) {
+	vfs_dq_init(inode);
+	err = dquot_alloc_inode(inode);
+	if (err) {
 		vfs_dq_drop(inode);
-		err = -EDQUOT;
 		goto fail_without_unlock;
 	}