Compile warning in Debian build log

[fklassen]

Found in Debian build log here

/bin/bash ../libtool  --tag=CC   --mode=link x86_64-linux-gnu-gcc -I../libopts -I..   -DTCPREPLAY -D_U_="__attribute__((unused))" -g -O2 -fdebug-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -Wformat -Werror=format-security -g -O0 -std=gnu99 -Wall  -Wfatal-errors -Wno-variadic-macros -Wno-format-contains-nul -I/usr/include  -Wl,-z,relro -Wl,-z,now -o tcpreplay tcpreplay-tcpreplay_opts.o tcpreplay-send_packets.o tcpreplay-signal_handler.o tcpreplay-tcpreplay.o tcpreplay-tcpreplay_api.o tcpreplay-replay.o ./common/libcommon.a ../lib/libstrl.a -L/usr/lib/x86_64-linux-gnu -lpcap  ../libopts/libopts.la -lrt -lnsl 
/bin/bash ../libtool  --tag=CC   --mode=link x86_64-linux-gnu-gcc -I../libopts -I..   -DTCPPREP -D_U_="__attribute__((unused))" -g -O2 -fdebug-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -Wformat -Werror=format-security -g -O0 -std=gnu99 -Wall  -Wfatal-errors -Wno-variadic-macros -Wno-format-contains-nul -I/usr/include  -Wl,-z,relro -Wl,-z,now -o tcpprep tcpprep-tcpprep_opts.o tcpprep-tcpprep.o tcpprep-tree.o tcpprep-tcpprep_api.o ./common/libcommon.a ../lib/libstrl.a -L/usr/lib/x86_64-linux-gnu -lpcap ../libopts/libopts.la  -lrt -lnsl 
tcpliveplay.c: In function 'do_checksum_liveplay':
tcpliveplay.c:1191:5: warning: 'sum' is used uninitialized in this function [-Wuninitialized]
     sum;
     ^~~

[fklassen]

fixed in PR #462