Fix digest comment removal for queries over 'query_digests_max_query_length'

Due to a typo/confusion, the boundary being used for comments check was
'd_max_len' instead of 'q_len'. This prevented the correct detection of
a comment start when the query exceeded 'query_digests_max_query_length'
which determines the value for 'd_max_len'.

lib/c_tokenizer.cpp

@@ -447,7 +447,8 @@ enum p_st get_next_st(const options* opts, struct shared_st* shared_st) {
 	// cmnt type 1 - start with '/*'
 	if(
 		// v1_crashing_payload_05
-		shared_st->q_cur_pos < (shared_st->d_max_len-1) && *shared_st->q == '/' && *(shared_st->q+1) == '*'
+		shared_st->q_cur_pos < (shared_st->q_len - 2) &&
+		*shared_st->q == '/' && *(shared_st->q+1) == '*'
 	) {
 		st = st_cmnt_type_1;
 	}
@@ -458,7 +459,7 @@ enum p_st get_next_st(const options* opts, struct shared_st* shared_st) {
 	// cmnt type 3 - start with '--'
 	else if (
 		// shared_st->query isn't over, need to check next character
-		shared_st->q_cur_pos < (shared_st->d_max_len-2) &&
+		shared_st->q_cur_pos < (shared_st->q_len - 2) &&
 		// found starting pattern '-- ' (space is required)
 		*shared_st->q == '-' && *(shared_st->q+1) == '-' && is_space_char(*(shared_st->q+2))
 	) {