Fix some compiler warnings

lib/MySQL_HostGroups_Manager.cpp

@@ -2679,7 +2679,7 @@ SQLite3_result * MySQL_HostGroups_Manager::SQL3_Free_Connections() {
 				delete conn;
 			}
 			char buf[1024];
-			for (l=0; l<mysrvc->ConnectionsFree->conns_length(); l++) {
+			for (l=0; l < (int) mysrvc->ConnectionsFree->conns_length(); l++) {
 				char **pta=(char **)malloc(sizeof(char *)*colnum);
 				MySQL_Connection *conn = mysrvc->ConnectionsFree->index(l);
 				sprintf(buf,"%d", conn->fd);

lib/MySQL_PreparedStatement.cpp

@@ -537,8 +537,8 @@ void MySQL_STMT_Manager_v14::ref_count_client(uint64_t _stmt_id ,int _v, bool lo
 				    (uint64_t *)malloc(max_purge * sizeof(uint64_t));
 				for (std::map<uint64_t, MySQL_STMT_Global_info *>::iterator it =
 				         map_stmt_id_to_info.begin();
-				     it != map_stmt_id_to_info.end(); ++it) {
-					if ( (i == (max_purge - 1)) || (i == (num_client_count_zero - 1)) ) {
+					it != map_stmt_id_to_info.end(); ++it) {
+					if ( (i == (max_purge - 1)) || (i == ((int)num_client_count_zero - 1)) ) {
 						break; // nothing left to clean up
 					}
 					MySQL_STMT_Global_info *a = it->second;

lib/MySQL_Protocol.cpp

@@ -1546,7 +1546,7 @@ bool MySQL_Protocol::process_pkt_handshake_response(unsigned char *pkt, unsigned
 			auth_plugin_id = 2;
 		}
 	}
-__switch_auth_plugin:
+//__switch_auth_plugin:
 	if (auth_plugin_id == 0) {
 		if ((*myds)->switching_auth_stage == 0) {
 			(*myds)->switching_auth_stage = 1;
@@ -2279,7 +2279,7 @@ unsigned int MySQL_ResultSet::add_row2(MYSQL_ROWS *row, unsigned char *offset) {
 }
 
 void MySQL_ResultSet::add_eof() {
-	PtrSize_t pkt;
+	//PtrSize_t pkt;
 	if (myprot) {
 		unsigned int nTrx=myds->sess->NumActiveTransactions();
 		uint16_t setStatus = (nTrx ? SERVER_STATUS_IN_TRANS : 0 );

lib/MySQL_Session.cpp

@@ -803,7 +803,7 @@ void MySQL_Session::generate_proxysql_internal_session_json(json &j) {
 }
 
 void MySQL_Session::return_proxysql_internal(PtrSize_t *pkt) {
-	int l = 0;
+	unsigned int l = 0;
 	l = strlen((char *)"PROXYSQL INTERNAL SESSION");
 	if (pkt->size==(5+l) && strncasecmp((char *)"PROXYSQL INTERNAL SESSION", (char *)pkt->ptr+5, l)==0) {
 		json j;

lib/mysql_data_stream.cpp

@@ -24,7 +24,6 @@ struct bio_st {
 	CRYPTO_RWLOCK *lock;
 };
 
-
 #define RESULTSET_BUFLEN_DS_16K 16000
 #define RESULTSET_BUFLEN_DS_1M 1000*1024