stdout raises EINVAL when flush() is called on a closed pipe under win32.

Maybe the exception should be caught and translated at raise location instead (sshserver.py).

mercurial/util.py

@@ -741,6 +741,14 b" if os.name == 'nt':"
                 if inst.errno != 0: raise
                 self.close()
                 raise IOError(errno.EPIPE, 'Broken pipe')
+                
+        def flush(self):
+            try:
+                return self.fp.flush()
+            except IOError, inst:
+                if inst.errno != errno.EINVAL: raise
+                self.close()
+                raise IOError(errno.EPIPE, 'Broken pipe')
 
     sys.stdout = winstdout(sys.stdout)