Better logging

Change-Id: I4d04436c9c73f80df833a8f338df8e43ea6250ae

tflite/libusb.cc

diff --git a/tflite/libusb.cc b/tflite/libusb.cc
index 0445998..5ffc587 100644
--- a/tflite/libusb.cc
+++ b/tflite/libusb.cc
@@ -11,6 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+#include <cstdio>
 #include <iostream>
 
 #include <emscripten.h>
@@ -29,6 +30,7 @@
 #define LIBUSB_LOG(...)           \
   do {                            \
     fprintf(stdout, __VA_ARGS__); \
+    fprintf(stdout, "\n");        \
     fflush(stdout);               \
   } while (false)
 #else  // LIBUSB_ENABLE_LOG
@@ -279,8 +281,6 @@
 }
 
 int LIBUSB_CALL libusb_handle_events(libusb_context *ctx) {
-  LIBUSB_LOG("libusb_handle_events");
-
   while (true) {
     if (auto item = ctx->completed_transfers.Pop(25/*ms*/)) {
       auto* transfer = item.value();