[LogFS] Clear PagePrivate when moving journal

do_logfs_journal_wl_pass() must call freeseg(), thereby clear
PagePrivate on all pages of the current journal segment.

Signed-off-by: Joern Engel <joern@logfs.org>
diff --git a/fs/logfs/journal.c b/fs/logfs/journal.c
index 6ad30a4..15454ac 100644
--- a/fs/logfs/journal.c
+++ b/fs/logfs/journal.c
@@ -821,6 +821,7 @@
 		logfs_set_segment_reserved(sb, segno);
 	}
 	/* Manually move journal_area */
+	freeseg(sb, area->a_segno);
 	area->a_segno = super->s_journal_seg[0];
 	area->a_is_open = 0;
 	area->a_used_bytes = 0;