HAL: usb: remove double declaration of current port status

Bug: 62272992
Test: Manually test whether port_type is updated on unplug.
Change-Id: I53da42b1dc8ec40b2b8a252a27719276fe63107c
diff --git a/usb/Usb.cpp b/usb/Usb.cpp
index 0d84fb6..3fc6552 100644
--- a/usb/Usb.cpp
+++ b/usb/Usb.cpp
@@ -513,7 +513,6 @@
       pthread_mutex_lock(&payload->usb->mLock);
       if (payload->usb->mCallback_1_0 != NULL) {
         sp<IUsbCallback> callback_V1_1 = IUsbCallback::castFrom(payload->usb->mCallback_1_0);
-        hidl_vec<PortStatus_1_1> currentPortStatus_1_1;
         Return<void> ret;
 
         // V1_1 callback