Merge changes Ibb109618,If1451871

* changes:
  adb: flush stderr after logging on Windows.
  adb: libusb: don't set interface alternate setting.

adb/adb_trace.cpp

@@ -41,6 +41,11 @@ void AdbLogger(android::base::LogId id, android::base::LogSeverity severity,
                const char* tag, const char* file, unsigned int line,
                const char* message) {
     android::base::StderrLogger(id, severity, tag, file, line, message);
+#if defined(_WIN32)
+    // stderr can be buffered on Windows (and setvbuf doesn't seem to work), so explicitly flush.
+    fflush(stderr);
+#endif
+
 #if !ADB_HOST
     // Only print logs of INFO or higher to logcat, so that `adb logcat` with adbd tracing on
     // doesn't result in exponential logging.

adb/client/usb_libusb.cpp

@@ -332,13 +332,6 @@ static void process_device(libusb_device* device) {
             return;
         }
 
-        rc = libusb_set_interface_alt_setting(handle.get(), interface_num, 0);
-        if (rc != 0) {
-            LOG(WARNING) << "failed to set interface alt setting for device '" << device_serial
-                         << "'" << libusb_error_name(rc);
-            return;
-        }
-
         for (uint8_t endpoint : {bulk_in, bulk_out}) {
             rc = libusb_clear_halt(handle.get(), endpoint);
             if (rc != 0) {