Memory leak fix.

src/Makefile

@@ -1,10 +1,10 @@
 
 BIN=smartdns 
 OBJS=smartdns.o fast_ping.o lib/bitops.o dns_client.o dns_server.o dns.o util.o tlog.o conf.o lib/rbtree.o lib/art.o
-CFLAGS=-g -O0 -Wall -Wstrict-prototypes -fno-omit-frame-pointer -Wstrict-aliasing 
+CFLAGS=-g -O3 -Wall -Wstrict-prototypes -fno-omit-frame-pointer -Wstrict-aliasing 
 CFLAGS +=-Iinclude
 CFLAGS += -DBASE_FILE_NAME=\"$(notdir $<)\"
-CXXFLAGS=-g -O0 -Wall -std=c++11 
+CXXFLAGS=-g -O3 -Wall -std=c++11 
 CXXFLAGS +=-Iinclude
 
 .PHONY: all