multi: fix `staticcheck` flags #2824

Job	Run time
verify that auto-generated documentation is up-to-date	27s
build and lint code	5m 7s
SQL compilation check	6s
run unit-test sqlite3 race	9m 36s
go mod check	9m 40s
RPC compilation check	1m 52s
run LiT unit tests	6m 35s
run LiT itests	3m 56s
run unit-test postgres race	11m 6s
	48m 25s

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