ext3: fix ext3_dx_readdir hash collision handling

commit 6a897cf447a83c9c3fd1b85a1e525c02d6eada7d upstream.

This fixes a bug where readdir() would return a directory entry twice
if there was a hash collision in an hash tree indexed directory.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Eugene Dashevsky <eugene@ibrix.com>
Signed-off-by: Mike Snitzer <msnitzer@ibrix.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Willy Tarreau <w@1wt.eu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>