multi: fix `staticcheck` flags #2827

Job	Run time
RPC compilation check	1m 54s
verify that auto-generated documentation is up-to-date	33s
run unit-test sqlite3 race	9m 41s
go mod check	10m 26s
SQL compilation check	9s
build and lint code	4m 57s
run LiT itests	3m 52s
run unit-test postgres race	10m 52s
run LiT unit tests	6m 49s
	49m 13s

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