ocfs2: remove handle argument to ocfs2_start_trans()

All callers either pass in NULL directly, or a local variable that is
already set to NULL.

The internals of ocfs2_start_trans() get a nice cleanup as a result.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
diff --git a/fs/ocfs2/localalloc.c b/fs/ocfs2/localalloc.c
index 9dd208d..2ae567a 100644
--- a/fs/ocfs2/localalloc.c
+++ b/fs/ocfs2/localalloc.c
@@ -238,7 +238,7 @@
 	}
 
 	/* WINDOW_MOVE_CREDITS is a bit heavy... */
-	handle = ocfs2_start_trans(osb, NULL, OCFS2_WINDOW_MOVE_CREDITS);
+	handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
 	if (IS_ERR(handle)) {
 		mlog_errno(PTR_ERR(handle));
 		handle = NULL;
@@ -405,7 +405,7 @@
 		goto out_mutex;
 	}
 
-	handle = ocfs2_start_trans(osb, NULL, OCFS2_WINDOW_MOVE_CREDITS);
+	handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
 	if (IS_ERR(handle)) {
 		status = PTR_ERR(handle);
 		handle = NULL;
@@ -896,7 +896,7 @@
 		goto bail;
 	}
 
-	handle = ocfs2_start_trans(osb, NULL, OCFS2_WINDOW_MOVE_CREDITS);
+	handle = ocfs2_start_trans(osb, OCFS2_WINDOW_MOVE_CREDITS);
 	if (IS_ERR(handle)) {
 		status = PTR_ERR(handle);
 		handle = NULL;