Fixed revlog.children.

Fixed revlog.children.
It was comparing a node to a rev, then appending a rev onto the list
of children being constructed instead of a node.

--- a/mercurial/revlog.py	Sat Aug 06 21:41:53 2005 +0100
+++ b/mercurial/revlog.py	Sat Aug 06 21:58:28 2005 +0100
@@ -185,8 +185,8 @@
         for r in range(p + 1, self.count()):
             n = self.node(r)
             for pn in self.parents(n):
-                if pn == p:
-                    c.append(p)
+                if pn == node:
+                    c.append(n)
                     continue
                 elif pn == nullid:
                     continue