Remove misleading diagnostic

Remove a noisy diagnostic that improperly implied an error condition.

Bug: 64022743
Test: video playback w/o diagnostic
Change-Id: I8fe7ae36c67550dccbdf0312f3a01adf10536db1
diff --git a/media/libstagefright/MediaCodec.cpp b/media/libstagefright/MediaCodec.cpp
index 23bee49..06a49d0 100644
--- a/media/libstagefright/MediaCodec.cpp
+++ b/media/libstagefright/MediaCodec.cpp
@@ -764,7 +764,7 @@
 
     // ignore stuff with no presentation time
     if (presentationUs <= 0) {
-        ALOGD("-- returned buffer has bad timestamp %" PRId64 ", ignore it", presentationUs);
+        ALOGV("-- returned buffer timestamp %" PRId64 " <= 0, ignore it", presentationUs);
         mLatencyUnknown++;
         return;
     }