pass iov_iter to ->direct_IO()

unmodified, for now

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/exofs/inode.c b/fs/exofs/inode.c
index d1c244d..3f9cafd 100644
--- a/fs/exofs/inode.c
+++ b/fs/exofs/inode.c
@@ -964,7 +964,7 @@
 
  /* TODO: Should be easy enough to do proprly */
 static ssize_t exofs_direct_IO(int rw, struct kiocb *iocb,
-		const struct iovec *iov, loff_t offset, unsigned long nr_segs)
+		struct iov_iter *iter, loff_t offset)
 {
 	return 0;
 }