Bug 1250497: Initalised Values used in WaveDemuxer.cpp. r=cpearce

dom/media/wave/WaveDemuxer.cpp

@@ -654,6 +654,7 @@ RIFFParser::RIFFHeader::RIFFHeader()
 void
 RIFFParser::RIFFHeader::Reset()
 {
+  memset(mRaw, 0, sizeof(mRaw));
   mPos = 0;
 }
 
@@ -732,6 +733,7 @@ HeaderParser::ChunkHeader::ChunkHeader()
 void
 HeaderParser::ChunkHeader::Reset()
 {
+  memset(mRaw, 0, sizeof(mRaw));
   mPos = 0;
 }
 
@@ -808,6 +810,7 @@ FormatParser::FormatChunk::FormatChunk()
 void
 FormatParser::FormatChunk::Reset()
 {
+  memset(mRaw, 0, sizeof(mRaw));
   mPos = 0;
 }