coverity: fix leaks and error paths #28827

Job	Run time
config	9s
fuzz smoke test	1m 28s
win+VS build	-1s
win build	5m 1s
static-analysis	7m 2s
win+Meson build	4m 19s
documentation	7m 22s
rust-analysis	1m 29s
sparse	3m 42s
osx-gcc (macos-14)	31m 47s
osx-reftable (macos-14)	29m 24s
osx-clang (macos-14)	36m 24s
linux-leaks (ubuntu:rolling)	57m 45s
fedora-breaking-changes-meson (fedora:latest)	22m 4s
linux32 (i386/ubuntu:20.04)	6h 0m 3s
almalinux-8 (almalinux:8)	24m 27s
linux-breaking-changes (ubuntu:rolling)	24m 13s
linux-asan-ubsan (ubuntu:rolling)	54m 50s
linux-reftable (ubuntu:rolling)	24m 29s
linux-reftable-leaks (ubuntu:rolling)	51m 7s
osx-meson (macos-14)	37m 30s
linux-sha256 (ubuntu:rolling)	24m 26s
debian-11 (debian:11)	21m 37s
linux-meson (ubuntu:rolling)	19m 39s
linux-musl-meson (alpine:latest)	18m 6s
linux-TEST-vars (ubuntu:20.04)	23m 45s
win+VS test	0s
win+Meson test (0)	7m 44s
win+Meson test (9)	7m 2s
win+Meson test (8)	10m 29s
win+Meson test (5)	7m 2s
win+Meson test (2)	59m 39s
win+Meson test (7)	8m 33s
win+Meson test (3)	12m 1s
win+Meson test (6)	12m 20s
win+Meson test (1)	6m 46s
win+Meson test (4)	30m 50s
win test (0)	10m 12s
win test (1)	7m 29s
win test (2)	7m 27s
win test (3)	10m 20s
win test (7)	7m 6s
win test (8)	7m 22s
win test (6)	20m 23s
win test (5)	10m 26s
win test (4)	1h 0m 26s
win test (9)	5m 43s
	20h 1m 27s

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