manifest: fix formatting

One poor unfortunate line was hanging way off the right hand side
of the universe.  Rescued it.

mercurial/manifest.c

@@ -242,7 +242,7 b' static PyObject *lmiter_iterentriesnext('
 	hash = nodeof(l);
 	consumed = pl + 41;
 	flags = PyString_FromStringAndSize(l->start + consumed,
-									   l->len - consumed - 1);
+					   l->len - consumed - 1);
 	if (!path || !hash || !flags) {
 		goto done;
 	}