build

tree: fix nvme_subsystem_scan_namespaces() return handling #3779

Job	Run time
build libnvme and nvme-cli separately	42s
fallback shared libraries	2m 22s
make static	43s
nvme-cli (gcc, debug)	46s
nvme-cli (clang, debug)	47s
libnvme (gcc, debug)	40s
nvme-cli (clang, release)	57s
muon minimal static	35s
libnvme (gcc, release)	47s
cross (s390x)	50s
nvme-cli (gcc, release)	53s
cross (ppc64le)	52s
libnvme (clang, release)	43s
libnvme (clang, debug)	40s
cross (armhf)	42s
	12m 59s

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