video_scaler: initialize pointer member in ctor

Refs #51340

Change-Id: Ic9da071d0d9bdaf55946f3c669de3080c7878d85

daemon/src/video/video_scaler.cpp

@@ -37,7 +37,7 @@
 
 namespace sfl_video {
 
-VideoScaler::VideoScaler() : ctx_(0), mode_(SWS_FAST_BILINEAR) {}
+VideoScaler::VideoScaler() : ctx_(0), mode_(SWS_FAST_BILINEAR), tmp_data_() {}
 
 VideoScaler::~VideoScaler() { sws_freeContext(ctx_); }