verify: initialize rp variable in case we hit out of memory stable

verify: initialize rp variable in case we hit out of memory

--- a/mercurial/verify.py	Thu Aug 05 16:17:17 2010 -0500
+++ b/mercurial/verify.py	Thu Aug 05 16:17:33 2010 -0500
@@ -231,6 +231,7 @@
 
         checklog(fl, f, lr)
         seen = {}
+        rp = None
         for i in fl:
             revisions += 1
             n = fl.node(i)