Fix uninitialized RGB in LoadPalette

core/src/fpdfapi/fpdf_render/fpdf_render_loadimage.cpp

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
  
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "../../../include/fxge/fx_ge.h"
 #include "../../../include/fxcodec/fx_codec.h"
 #include "../../../include/fpdfapi/fpdf_module.h"
 #include "../../../include/fpdfapi/fpdf_render.h"
@@ skipping 851 matching lines @@
     if (m_bpc * m_nComponents == 1) {
         if (m_bDefaultDecode && (m_Family == PDFCS_DEVICEGRAY || m_Family == PDFCS_DEVICERGB)) {
             return;
         }
         if (m_pColorSpace->CountComponents() > 3) {
             return;
         }
         FX_FLOAT color_values[3];
         color_values[0] = m_pCompData[0].m_DecodeMin;
         color_values[1] = color_values[2] = color_values[0];
-        FX_FLOAT R, G, B;
+        FX_FLOAT R=0.0f, G=0.0f, B=0.0f;
         m_pColorSpace->GetRGB(color_values, R, G, B);
         FX_ARGB argb0 = ArgbEncode(255, FXSYS_round(R * 255), FXSYS_round(G * 255), FXSYS_round(B * 255));
         color_values[0] += m_pCompData[0].m_DecodeStep;
         color_values[1] += m_pCompData[0].m_DecodeStep;
         color_values[2] += m_pCompData[0].m_DecodeStep;
         m_pColorSpace->GetRGB(color_values, R, G, B);
         FX_ARGB argb1 = ArgbEncode(255, FXSYS_round(R * 255), FXSYS_round(G * 255), FXSYS_round(B * 255));
         if (argb0 != 0xFF000000 || argb1 != 0xFFFFFFFF) {
             SetPaletteArgb(0, argb0);
             SetPaletteArgb(1, argb1);
@@ skipping 624 matching lines @@
     if (!m_bCached) {
         if (m_pBitmap) {
             delete m_pBitmap;
             m_pBitmap = NULL;
         }
         if (m_pMask) {
             delete m_pMask;
         }
     }
 }