task: bugfix for ttrpc server closed #1116

Job	Run time
tests (vmm/sandbox, --all-features)	3m 31s
checks (vmm/sandbox, --all-features)	5m 56s
tests (vmm/task, --all-features)	5m 8s
checks (vmm/task, --all-features)	4m 8s
tests (shim, --all-features)	2m 48s
checks (shim, --all-features)	3m 41s
tests (quark, --all-features)	4m 55s
checks (quark, --all-features)	3m 51s
tests (runc, --all-features)	5m 9s
checks (runc, --all-features)	4m 34s
tests (wasm, --features=wasmedge, 0.13.5)	2m 51s
checks (wasm, --features=wasmedge, 0.13.5)	4m 18s
tests (wasm, --features=wasmtime)	3m 18s
checks (wasm, --features=wasmtime)	5m 5s
	59m 13s

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