--- a/mercurial/util.py	Mon Oct 03 15:06:46 2005 -0700
+++ b/mercurial/util.py	Mon Oct 03 16:07:54 2005 -0700
@@ -545,7 +545,7 @@
     socket or some other type of file that sometimes reads less data
     than is requested."""
     s = f.read(size)
-    while len(s) >= 0:
+    while len(s) > 0:
         yield s
         s = f.read(size)