BUG/MINOR: contrib/halog: fixing small memory leak

Issue was identified by cppcheck
diff --git a/contrib/halog/halog.c b/contrib/halog/halog.c
index fc927bd..cb815d8 100644
--- a/contrib/halog/halog.c
+++ b/contrib/halog/halog.c
@@ -1569,6 +1569,7 @@
 
 	if (unlikely(!*e)) {
 		truncated_line(linenum, line);
+		free(ustat);
 		return;
 	}