fix the regression from "direct-io: Fix negative return from dio read beyond eof"

commit 2d4594ac upstream.

Sure, it's better to bail out of past-the-eof read and return 0 than return
a bogus negative value on such.  Only we'd better make sure we are bailing out
with 0 and not -ENOMEM...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

fs/direct-io.c

@@ -1165,6 +1165,7 @@ do_blockdev_direct_IO(struct kiocb *iocb, struct inode *inode,
 		if (dio->flags & DIO_LOCKING)
 			mutex_unlock(&inode->i_mutex);
 		kmem_cache_free(dio_cache, dio);
+		retval = 0;
 		goto out;
 	}