test

Add missed clear to unsafe_free_list_storage #481

Job	Run time
build-spm	18s
build	52s
check (Debug, gnu-6, 14)	1m 28s
docs	1m 11s
check (Debug, gnu-7, 14)	1m 29s
check (Debug, llvm-5, 14)	1m 23s
check (Debug, llvm-6, 14)	1m 18s
check (Release, gnu-6, 14)	1m 9s
check (Release, gnu-7, 14)	1m 27s
check (Release, llvm-5, 14)	1s
check (Release, llvm-6, 14)	27s
check (Debug, gnu-9, 14, coverage)	1m 28s
check (Debug, gnu-8, 17)	1m 27s
check (Debug, llvm-9, 17, fuzzers)	1m 27s
check (Debug, gnu-11, 20)	1m 16s
check (Debug, llvm-13, 20)	1m 18s
check (Debug, llvm-8, 14, sanitize)	1m 26s
check (Release, gnu-9, 14, benchmark)	1m 25s
check (Release, llvm-10, 14, benchmark)	1m 25s
	22m 15s

Provide feedback