Meson

nixd/lib/Controller: use `CheckReturn` to simplify early-returns (NFC) #3259

Job	Run time
nix-build-develop-clang (none, release, true)	2m 43s
nix-build-develop-gcc (none, release, true)	2m 55s
nix-build-develop-clang (none, release, false)	2m 57s
nix-build-develop-gcc (none, release, false)	3m 8s
nix-build-develop-clang (none, debug, true)	2m 40s
nix-build-develop-gcc (none, debug, true)	2m 48s
nix-build-develop-clang (none, debug, false)	2m 40s
nix-build-develop-gcc (none, debug, false)	2m 55s
nix-build-develop-gcc (address, release, true)	5m 8s
nix-build-develop-gcc (address, release, false)	4m 45s
nix-build-develop-gcc (address, debug, true)	4m 8s
nix-build-develop-gcc (address, debug, false)	4m 4s
nix-build-develop-gcc (undefined, release, true)	4m 11s
nix-build-develop-gcc (undefined, release, false)	4m 10s
nix-build-develop-gcc (undefined, debug, true)	3m 12s
nix-build-develop-gcc (undefined, debug, false)	3m 15s
	55m 39s

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