multi: fix `staticcheck` flags #2804

Job	Run time
SQL compilation check	9s
build and lint code	7m 53s
run unit-test sqlite3 race	6m 33s
RPC compilation check	1m 27s
verify that auto-generated documentation is up-to-date	3m 21s
go mod check	10m 19s
run LiT itests	5m 49s
run unit-test postgres race	7m 2s
run LiT unit tests	6m 53s
	49m 26s

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