[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/segment.c b/fs/logfs/segment.c
index ff9d7f3..0ecd8f0 100644
--- a/fs/logfs/segment.c
+++ b/fs/logfs/segment.c
@@ -691,7 +691,7 @@
 	return 0;
 }
 
-static void freeseg(struct super_block *sb, u32 segno)
+void freeseg(struct super_block *sb, u32 segno)
 {
 	struct logfs_super *super = logfs_super(sb);
 	struct address_space *mapping = super->s_mapping_inode->i_mapping;