Zstd: Don't leave errors behind if loading library failed. #21

Job	Run time
basic_clang	5m 9s
basic_gcc	5m 12s
check_docs	1m 2s
check_update	1m 14s
check-ansi	2m 34s
self-hosted (freebsd-13.2)	1s
self-hosted (ubuntu-arm64-22.04)	1s
address_ub_sanitizer	10m 19s
enable_non-default_options	4m 33s
full_featured	5m 42s
fuzz_tests	3m 8s
legacy	3m 55s
memory_sanitizer	19m 14s
minimal	2m 24s
no-deprecated	4m 49s
no-legacy	5m 23s
no-shared-macos	9m 18s
non-caching	15m 4s
no-shared-ubuntu	3m 48s
out-of-readonly-source-and-install-macos	8m 46s
out-of-readonly-source-and-install-ubuntu	6m 53s
threads_sanitizer	5m 21s
external-test-cf-quiche	3m 42s
external-test-pyca (1.51.0, 3.9)	9m 3s
external-tests	10m 46s
	2h 27m 21s

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