ic: Fix NULL ptr deref on log of duplicate routes. #3354

Job	Run time
osx clang --disable-ssl	2m 28s
Prepare container	3m 19s
linux rpm fedora	6m 43s
linux gcc --disable-ssl	2m 35s
linux clang --disable-ssl	2m 52s
linux gcc test -300	9m 35s
linux gcc test 301-600	6m 16s
linux gcc test 601- unstable	6m 7s
linux clang test sanitizers -300	12m 59s
linux clang test sanitizers 301-600	9m 2s
linux clang test sanitizers 601- unstable	10m 46s
linux gcc test -ljemalloc -300	9m 56s
linux gcc test -ljemalloc 301-600	6m 24s
linux gcc test -ljemalloc 601- unstable	6m 34s
linux gcc system-test-dpdk dpdk -100	17m 0s
linux gcc system-test-dpdk dpdk 101- unstable	14m 8s
linux gcc system-test-userspace -100	15m 47s
linux gcc system-test-userspace 101- unstable	13m 7s
linux gcc system-test -100	18m 29s
linux gcc system-test 101- unstable	17m 29s
linux clang system-test sanitizers -100	20m 10s
linux clang system-test sanitizers 101- unstable	19m 34s
linux x86 gcc --disable-ssl	2m 32s
	3h 53m 52s

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