ocfs2: Remove struct ocfs2_journal_handle in favor of handle_t

This is mostly a search and replace as ocfs2_journal_handle is now no more
than a container for a handle_t pointer.

ocfs2_commit_trans() becomes very straight forward, and we remove some out
of date comments / code.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
diff --git a/fs/ocfs2/ioctl.c b/fs/ocfs2/ioctl.c
index 7527358..4768be5 100644
--- a/fs/ocfs2/ioctl.c
+++ b/fs/ocfs2/ioctl.c
@@ -43,7 +43,7 @@
 {
 	struct ocfs2_inode_info *ocfs2_inode = OCFS2_I(inode);
 	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
-	struct ocfs2_journal_handle *handle = NULL;
+	handle_t *handle = NULL;
 	struct buffer_head *bh = NULL;
 	unsigned oldflags;
 	int status;