util: fix signature of setsockopt in socket observer

The format string expected the result, callers all passed the result,
but we didn't actually accept the result to this function. I swear
I've looked at this code a dozen times trying to find the problem, and
it was this simple all along.

Differential Revision: https://phab.mercurial-scm.org/D4253

mercurial/util.py

@@ -948,12 +948,12 b' class socketobserver(baseproxyobserver):'
 
         self.fh.write('%s> gettimeout() -> %f\n' % (self.name, res))
 
-    def setsockopt(self, level, optname, value):
+    def setsockopt(self, res, level, optname, value):
         if not self.states:
             return
 
         self.fh.write('%s> setsockopt(%r, %r, %r) -> %r\n' % (
-            self.name, level, optname, value))
+            self.name, level, optname, value, res))
 
 def makeloggingsocket(logh, fh, name, reads=True, writes=True, states=True,
                       logdata=False, logdataapis=True):