route-table: Fix potential memory leak. #6788

Job	Run time
build oss-fuzz fuzzers	3m 5s
osx clang --disable-ssl	1m 45s
dpdk gcc (ubuntu-24.04)	7s
libreswan (ubuntu-24.04)	5s
linux deb no dpdk	6m 51s
linux rpm fedora	4m 9s
clang-analyze-cache	11m 15s
linux gcc --disable-ssl	2m 45s
linux clang --disable-ssl	4m 13s
linux gcc c99	2m 28s
linux clang c99	2m 30s
linux gcc test	8m 35s
linux clang address,undefined test	16m 28s
linux gcc test --enable-shared	11m 24s
linux clang test --enable-shared	11m 43s
linux gcc check check-dpdk dpdk	19m 56s
linux clang check check-dpdk dpdk	19m 55s
linux gcc test -ljemalloc	9m 9s
linux clang test -ljemalloc	8m 55s
linux gcc --enable-afxdp	2m 36s
linux clang --enable-afxdp	2m 33s
linux gcc dpdk --enable-shared	3m 39s
linux clang dpdk --enable-shared	3m 54s
linux gcc dpdk-shared	2m 46s
linux clang dpdk-shared	3m 1s
linux gcc dpdk-shared --enable-shared	3m 53s
linux clang dpdk-shared --enable-shared	3m 45s
linux gcc m32 --disable-ssl	2m 34s
linux gcc check-ovsdb-cluster	6m 46s
linux gcc check-kernel -100	10m 23s
linux gcc check-kernel 100-	17m 20s
linux clang address,undefined check-kernel -100	13m 11s
linux clang address,undefined check-kernel 100-	19m 45s
linux gcc check-offloads -100	9m 29s
linux gcc check-offloads 100-	12m 5s
linux gcc dpdk check-system-userspace	12m 47s
linux clang address,undefined dpdk check-system-userspace	16m 33s
linux gcc dpdk check-system-tso	12m 40s
linux gcc dpdk check-afxdp	12m 34s
clang-analyze	12m 34s
	5h 30m 6s

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