reiserfs: clean-up function return type

Turn 'reiserfs_flush_old_commits()' into a void function because the callers
do not cares about what it returns anyway.

We are going to remove the 'sb->s_dirt' field completely and this patch is a
small step towards this direction.

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/reiserfs/reiserfs.h b/fs/reiserfs/reiserfs.h
index 14a4f9d..5c70055 100644
--- a/fs/reiserfs/reiserfs.h
+++ b/fs/reiserfs/reiserfs.h
@@ -2452,7 +2452,7 @@
 int reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle *);
 int reiserfs_commit_page(struct inode *inode, struct page *page,
 			 unsigned from, unsigned to);
-int reiserfs_flush_old_commits(struct super_block *);
+void reiserfs_flush_old_commits(struct super_block *);
 int reiserfs_commit_for_inode(struct inode *);
 int reiserfs_inode_needs_commit(struct inode *);
 void reiserfs_update_inode_transaction(struct inode *);