Fix Partition split_path calculation #9947

Job	Run time
unit-test	1m 14s
integration-test (arch, arch)	17s
integration-test (arch, debian)	15s
integration-test (azure, arch)	14s
integration-test (arch, fedora)	15s
integration-test (azure, fedora)	17s
integration-test (azure, debian)	52s
integration-test (azure, opensuse)	16s
integration-test (centos, arch)	49s
integration-test (centos, debian)	14s
integration-test (centos, opensuse)	18s
integration-test (azure, ubuntu)	16s
integration-test (centos, ubuntu)	59s
integration-test (debian, arch)	21s
integration-test (debian, debian)	1m 6s
integration-test (debian, fedora)	15s
integration-test (centos, fedora)	17s
integration-test (debian, ubuntu)	14s
integration-test (fedora, arch)	16s
integration-test (fedora, debian)	14s
integration-test (fedora, fedora)	13s
integration-test (fedora, opensuse)	1m 20s
integration-test (fedora, ubuntu)	1m 50s
integration-test (opensuse, arch)	15s
integration-test (opensuse, debian)	16s
integration-test (opensuse, fedora)	17s
integration-test (opensuse, opensuse)	14s
integration-test (opensuse, ubuntu)	15s
integration-test (ubuntu, arch)	2m 46s
integration-test (ubuntu, debian)	21s
integration-test (ubuntu, fedora)	17s
integration-test (ubuntu, ubuntu)	14s
	17m 17s

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