pathencode: skip encoding if input is already longer than maxstorepathlen

Calling basicencode may make the path longer, never shorter. If it's already
too long before, then we don't even need to basicencode it.

mercurial/pathencode.c

@@ -501,6 +501,12 b' PyObject *pathencode(PyObject *self, PyO'
 		return NULL;
 	}
 
+	if (len > maxstorepathlen) {
+		newobj = Py_None;
+		Py_INCREF(newobj);
+		return newobj;
+	}
+
 	newlen = len ? basicencode(NULL, 0, path, len + 1) : 1;
 
 	if (newlen <= maxstorepathlen + 1) {