vfs: Use lowercase names of quota functions

Use lowercase names of quota functions instead of old uppercase ones.

Signed-off-by: Jan Kara <jack@suse.cz>
CC: Alexander Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/open.c b/fs/open.c
index a3a78ce..75b6167 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -273,7 +273,7 @@
 	if (!error)
 		error = security_path_truncate(&path, length, 0);
 	if (!error) {
-		DQUOT_INIT(inode);
+		vfs_dq_init(inode);
 		error = do_truncate(path.dentry, length, 0, NULL);
 	}