route-table: Fix potential memory leak. #6783

Job	Run time
osx clang --disable-ssl	1m 51s
linux rpm fedora	4m 18s
linux deb no dpdk	7m 46s
dpdk gcc (ubuntu-24.04)	8s
libreswan (ubuntu-24.04)	8s
build oss-fuzz fuzzers	3m 1s
clang-analyze-cache	10m 51s
linux gcc --disable-ssl	2m 43s
linux clang --disable-ssl	4m 32s
linux gcc c99	3m 46s
linux clang c99	4m 7s
linux gcc test	8m 47s
linux clang address,undefined test	16m 29s
linux gcc test --enable-shared	12m 30s
linux clang test --enable-shared	11m 18s
linux gcc check check-dpdk dpdk	20m 41s
linux clang check check-dpdk dpdk	20m 40s
linux gcc test -ljemalloc	9m 8s
linux clang test -ljemalloc	9m 27s
linux gcc --enable-afxdp	3m 35s
linux clang --enable-afxdp	4m 5s
linux gcc dpdk --enable-shared	4m 6s
linux clang dpdk --enable-shared	4m 19s
linux gcc dpdk-shared	3m 33s
linux clang dpdk-shared	3m 10s
linux gcc dpdk-shared --enable-shared	4m 48s
linux clang dpdk-shared --enable-shared	3m 55s
linux gcc m32 --disable-ssl	5m 7s
linux gcc check-ovsdb-cluster	7m 10s
linux gcc check-kernel -100	10m 30s
linux gcc check-kernel 100-	18m 1s
linux clang address,undefined check-kernel -100	13m 40s
linux clang address,undefined check-kernel 100-	20m 34s
linux gcc check-offloads -100	9m 48s
linux gcc check-offloads 100-	13m 11s
linux gcc dpdk check-system-userspace	13m 1s
linux clang address,undefined dpdk check-system-userspace	17m 43s
linux gcc dpdk check-system-tso	13m 24s
linux gcc dpdk check-afxdp	12m 57s
clang-analyze	11m 24s
	5h 50m 12s

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