Merge pull request #296 from vstakhov/vstakhov-fix-fuzz

Fix issue with setting length when parsing vars

src/ucl_parser.c

@@ -349,6 +349,8 @@ ucl_check_variable_safe (struct ucl_parser *parser, const char *ptr, size_t rema
 		if (parser->var_handler (ptr, remain, &dst, &dstlen, &need_free,
 				parser->var_data)) {
 			*found = true;
+			*out_len = dstlen;
+
 			if (need_free) {
 				free (dst);
 			}