fix compile error for msdk build

Author: Yang, JunchaoX

source/core/owt_base/MsdkFrameDecoder.cpp

@@ -455,7 +455,7 @@ void MsdkFrameDecoder::updateBitstream(const Frame& frame)
                 , newSize
                 );
 
-        uint8_t* tmpDataBuf = realloc(m_bitstream->Data, newSize);
+        uint8_t* tmpDataBuf = (uint8_t*)realloc(m_bitstream->Data, newSize);
         if (tmpDataBuf == nullptr) {
             free(m_bitstream->Data);
             m_bitstream.reset();