sp-trie: correctly avoid panicking when decoding bad compact proofs #6109

Job	Run time
preflight / preflight	48s
preflight / ci-versions	54s
cargo-check-benches (master)	21m 1s
test-frame-ui	49m 47s
cargo-check-benches (current)	26m 52s
test-full-crypto-feature	2m 37s
cargo-check-each-crate (1)	45m 47s
cargo-check-each-crate (2)	39m 59s
test-node-metrics	14m 2s
cargo-check-each-crate (3)	19m 2s
cargo-check-each-crate (4)	39m 28s
cargo-check-all-crate-macos	11m 21s
cargo-check-each-crate (5)	46m 9s
cargo-check-each-crate (6)	22m 13s
cargo-check-each-crate (7)	45m 2s
test-frame-examples-compile-to-wasm	3m 16s
test-deterministic-wasm	9m 12s
check-tracing	2m 40s
check-metadata-hash	8m 19s
node-bench-regression-guard	17s
All test misc tests passed	1s
	6h 48m 47s

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