fix ci

Signed-off-by: Kai Xia <kaix+github@fastmail.com>

.golangci.yaml

@@ -152,6 +152,9 @@ linters:
           - gocognit
           - gocyclo
         path: _test\.go$
+      - linters:
+          - nolintlint
+        path: 'pkg/tools/(i2c\.go|spi\.go)$'
 
 issues:
   max-issues-per-linter: 0

pkg/devices/sources/usb_linux.go

@@ -35,9 +35,8 @@ var usbClassToCapability = map[string]string{
 }
 
 type USBMonitor struct {
-	cmd    *exec.Cmd
-	cancel context.CancelFunc
-	mu     sync.Mutex
+	cmd *exec.Cmd
+	mu  sync.Mutex
 }
 
 func NewUSBMonitor() *USBMonitor {