cpi: direct_mapping: always zero spare capacity if account alloc chan… #6

Job	Run time
check	0s
cargo-test-sbf (token/program)	10m 18s
test	0s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	14m 16s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	15m 46s
cargo-test-sbf (token-upgrade/program)	13m 43s
cargo-test-sbf (feature-proposal/program)	16m 34s
cargo-test-sbf (governance/addin-mock/program, governance/program)	12m 51s
cargo-test-sbf (memo/program)	9m 22s
cargo-test-sbf (name-service/program)	8m 16s
cargo-test-sbf (stake-pool/program)	22m 4s
cargo-test-sbf (single-pool/program)	11m 0s
	2h 14m 10s

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