vendor: update USB HID lib (fix macOS crash)

vendor/github.com/karalabe/hid/hid_enabled.go

@@ -2,7 +2,7 @@
 // Copyright (c) 2017 Péter Szilágyi. All rights reserved.
 //
 // This file is released under the 3-clause BSD license. Note however that Linux
-// support depends on libusb, released under GNU GPL 2.1 or later.
+// support depends on libusb, released under LGNU GPL 2.1 or later.
 
 // +build linux,cgo darwin,!ios,cgo windows,cgo
 
@@ -48,6 +48,15 @@ import (
 	"unsafe"
 )
 
+// enumerateLock is a mutex serializing access to USB device enumeration needed
+// by the macOS USB HID system calls, which require 2 consecutive method calls
+// for enumeration, causing crashes if called concurrently.
+//
+// For more details, see:
+//   https://developer.apple.com/documentation/iokit/1438371-iohidmanagersetdevicematching
+//   > "subsequent calls will cause the hid manager to release previously enumerated devices"
+var enumerateLock sync.Mutex
+
 func init() {
 	// Initialize the HIDAPI library
 	C.hid_init()
@@ -66,6 +75,9 @@ func Supported() bool {
 //  - If the product id is set to 0 then any product matches.
 //  - If the vendor and product id are both 0, all HID devices are returned.
 func Enumerate(vendorID uint16, productID uint16) []DeviceInfo {
+	enumerateLock.Lock()
+	defer enumerateLock.Unlock()
+
 	// Gather all device infos and ensure they are freed before returning
 	head := C.hid_enumerate(C.ushort(vendorID), C.ushort(productID))
 	if head == nil {