fix negative slice index error in keymutex

pkg/util/keymutex/hashed.go

@@ -45,20 +45,20 @@ type hashedKeyMutex struct {
 // Acquires a lock associated with the specified ID.
 func (km *hashedKeyMutex) LockKey(id string) {
 	klog.V(5).Infof("hashedKeyMutex.LockKey(...) called for id %q\r\n", id)
-	km.mutexes[km.hash(id)%len(km.mutexes)].Lock()
+	km.mutexes[km.hash(id)%uint32(len(km.mutexes))].Lock()
 	klog.V(5).Infof("hashedKeyMutex.LockKey(...) for id %q completed.\r\n", id)
 }
 
 // Releases the lock associated with the specified ID.
 func (km *hashedKeyMutex) UnlockKey(id string) error {
 	klog.V(5).Infof("hashedKeyMutex.UnlockKey(...) called for id %q\r\n", id)
-	km.mutexes[km.hash(id)%len(km.mutexes)].Unlock()
+	km.mutexes[km.hash(id)%uint32(len(km.mutexes))].Unlock()
 	klog.V(5).Infof("hashedKeyMutex.UnlockKey(...) for id %q completed.\r\n", id)
 	return nil
 }
 
-func (km *hashedKeyMutex) hash(id string) int {
+func (km *hashedKeyMutex) hash(id string) uint32 {
 	h := fnv.New32a()
 	h.Write([]byte(id))
-	return int(h.Sum32())
+	return h.Sum32()
 }