core: fix golang-ci lints and add a config

core/internal/server/brightness/ddc.go

@@ -98,7 +98,7 @@ func (b *DDCBackend) probeDDCDevice(bus int) (*ddcDevice, error) {
 	}
 
 	dummy := make([]byte, 32)
-	syscall.Read(fd, dummy)
+	syscall.Read(fd, dummy) //nolint:errcheck
 
 	writebuf := []byte{0x00}
 	n, err := syscall.Write(fd, writebuf)

core/internal/server/brightness/logind.go

@@ -13,8 +13,7 @@ type DBusConn interface {
 }
 
 type LogindBackend struct {
-	conn     DBusConn
-	connOnce bool
+	conn DBusConn
 }
 
 func NewLogindBackend() (*LogindBackend, error) {