[PATCH 2 of 5 stable cpychecker] dirs: fix leak of iterator in dirs_fromiter

[Augie Fackler]

# HG changeset patch
# User Augie Fackler <augie at google.com>
# Date 1422371404 18000
#      Tue Jan 27 10:10:04 2015 -0500
# Branch stable
# Node ID 190d25e48de681423dac253939139a970e46cfc1
# Parent  25af70176080cd54761b1624c900dc19252c9994
dirs: fix leak of iterator in dirs_fromiter

Spotted with cpychecker.

diff --git a/mercurial/dirs.c b/mercurial/dirs.c
--- a/mercurial/dirs.c
+++ b/mercurial/dirs.c
@@ -175,6 +175,7 @@ static int dirs_fromiter(PyObject *dirs,
 	}
 
 	ret = PyErr_Occurred() ? -1 : 0;
+	Py_DECREF(iter);
 	Py_XDECREF(item);
 	return ret;
 }