multi: fix `staticcheck` flags #2826

Job	Run time
verify that auto-generated documentation is up-to-date	22s
run unit-test sqlite3 race	9m 33s
build and lint code	30s
SQL compilation check	10s
run LiT unit tests	6m 31s
run unit-test postgres race	10m 54s
RPC compilation check	1m 51s
go mod check	10m 42s
run LiT itests	3m 55s
	44m 28s

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