Fix an issue where a fixed number of bits per sample is used for seek position calculation.

The patch was from NV.

bug - 3278233

Change-Id: I9bc22b6b0ee6bfa5d4617a8c497f67eb577efca4

media/libstagefright/WAVExtractor.cpp

@@ -318,7 +318,7 @@ status_t WAVSource::read(
     int64_t seekTimeUs;
     ReadOptions::SeekMode mode;
     if (options != NULL && options->getSeekTo(&seekTimeUs, &mode)) {
-        int64_t pos = (seekTimeUs * mSampleRate) / 1000000 * mNumChannels * 2;
+        int64_t pos = (seekTimeUs * mSampleRate) / 1000000 * mNumChannels * (mBitsPerSample >> 3);
         if (pos > mSize) {
             pos = mSize;
         }