[PATCH] ext3: fix commit assertion failure

We're getting asserion failures in commit in data=journal mode.

journal_unmap_buffer() has unexpectedly donated this buffer to the committing
transaction, and the commit-time assertion doesn't expect that to happen.  It
doesn't happen in 2.4 because both paths are under lock_journal().

Simply remove the assertion: the commit code will uncheckpoint the buffer and
then recheckpoint it if needed.

fs/jbd/commit.c

@@ -699,7 +699,6 @@ void journal_commit_transaction(journal_t *journal)
 		cp_transaction = jh->b_cp_transaction;
 		if (cp_transaction) {
 			JBUFFER_TRACE(jh, "remove from old cp transaction");
-			J_ASSERT_JH(jh, commit_transaction != cp_transaction);
 			__journal_remove_checkpoint(jh);
 		}