increased LTOSTR_MAX_SIZE to backport overflow fix in 4.4

lib/parser_aux.h

diff --git a/lib/parser_aux.h b/lib/parser_aux.h
index 1f1aec2..7b2dfd4 100644
--- a/lib/parser_aux.h
+++ b/lib/parser_aux.h
@@ -52,7 +52,7 @@
 
 void _asn1_delete_list_and_nodes (void);
 
-#define LTOSTR_MAX_SIZE 20
+#define LTOSTR_MAX_SIZE 22
 char *_asn1_ltostr (long v, char *str);
 
 asn1_node _asn1_find_up (asn1_node node);