task: bugfix for ttrpc server closed #640

Job	Run time
checks (vmm/sandbox, --all-features)	4m 40s
tests (vmm/sandbox, --all-features)	3m 33s
checks (vmm/task, --all-features)	3m 58s
checks (shim, --all-features)	3m 47s
tests (vmm/task, --all-features)	2m 43s
checks (quark, --all-features)	3m 39s
tests (shim, --all-features)	2m 40s
checks (runc, --all-features)	4m 5s
tests (quark, --all-features)	2m 32s
checks (wasm, --features=wasmedge, 0.13.5)	4m 16s
tests (runc, --all-features)	2m 39s
checks (wasm, --features=wasmtime)	4m 24s
tests (wasm, --features=wasmedge, 0.13.5)	3m 7s
tests (wasm, --features=wasmtime)	3m 13s
	49m 16s

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