setdiscovery: remove initialsamplesize from a condition

It seems more direct to compare the actual sample size. That way we
can change the sample taken earlier in the code without breaking the
condition.

Differential Revision: https://phab.mercurial-scm.org/D2644

mercurial/setdiscovery.py

@@ -175,7 +175,7 b' def findcommonheads(ui, local, remote,'
         ui.debug("all remote heads known locally\n")
         return (srvheadhashes, False, srvheadhashes,)
 
-    if sample and len(ownheads) <= initialsamplesize and all(yesno):
+    if len(sample) == len(ownheads) and all(yesno):
         ui.note(_("all local heads known remotely\n"))
         ownheadhashes = dag.externalizeall(ownheads)
         return (ownheadhashes, True, srvheadhashes,)