Initialise variables on init.

Otherwise strangeness happens.

krita/plugins/extensions/dockers/colorslider/kis_color_slider_input.cpp

@@ -97,7 +97,13 @@ void KisColorSliderInput::init()
 }
 
 KisHSXColorSliderInput::KisHSXColorSliderInput(QWidget* parent, const int type, KoColor* color, KoColorDisplayRendererInterface *displayRenderer, KisCanvas2* canvas) : KisColorSliderInput(parent, color, type, displayRenderer, canvas),
-m_canvas(canvas)
+m_canvas(canvas),
+m_hue(0),
+m_sat(0),
+m_val(0),
+R(0),
+G(0),
+B(0)
 {
     init();
 }

krita/plugins/extensions/dockers/colorslider/kis_hsv_slider.cpp

@@ -41,7 +41,10 @@ struct KisHSVSlider::Private
 };
 
 KisHSVSlider::KisHSVSlider(QWidget* parent, KoColorDisplayRendererInterface *displayRenderer)
-  : KSelector(parent), d(new Private)
+  : KSelector(parent), d(new Private),
+  R(0),
+  G(0),
+  B(0)
 {
     setMaximum(255);
     d->displayRenderer = displayRenderer;