multi: fix `staticcheck` flags #2825

Job	Run time
verify that auto-generated documentation is up-to-date	29s
build and lint code	4m 56s
SQL compilation check	6s
run unit-test sqlite3 race	9m 21s
RPC compilation check	1m 58s
go mod check	9m 32s
run unit-test postgres race	10m 33s
run LiT itests	4m 12s
run LiT unit tests	6m 55s
	48m 2s

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