Fix some memory leakage found
diff --git a/libasn1parser/asn1parser.h b/libasn1parser/asn1parser.h
index e83b747..4926c77 100644
--- a/libasn1parser/asn1parser.h
+++ b/libasn1parser/asn1parser.h
@@ -70,5 +70,6 @@
 	enum asn1p_flags);
 
 int asn1p_atoi(const char *ptr, asn1c_integer_t *r_value);
+int asn1p_lex_destroy();
 
 #endif	/* ASN1PARSER_H */