Fix uninitialized RGB in translating scanline

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 974 matching lines @@
             return;
         } else if (m_bpc == 8) {
             if (m_nComponents == m_pColorSpace->CountComponents())
                 m_pColorSpace->TranslateImageLine(dest_scan, src_scan, m_Width, m_Width, m_Height,
                                                   m_bLoadMask && m_GroupFamily == PDFCS_DEVICECMYK && m_Family == PDFCS_DEVICECMYK);
             return;
         }
     }
     CFX_FixedBufGrow<FX_FLOAT, 16> color_values1(m_nComponents);
     FX_FLOAT* color_values = color_values1;
-    FX_FLOAT R, G, B;
+    FX_FLOAT R = 0.0f, G = 0.0f, B = 0.0f;
     if (m_bpc == 8) {
         int src_byte_pos = 0;
         int dest_byte_pos = 0;
         for (int column = 0; column < m_Width; column ++) {
             for (FX_DWORD color = 0; color < m_nComponents; color ++) {
                 int data = src_scan[src_byte_pos ++];
                 color_values[color] = m_pCompData[color].m_DecodeMin +
                                       m_pCompData[color].m_DecodeStep * data;
             }
             if (m_bLoadMask && m_GroupFamily == PDFCS_DEVICECMYK && m_Family == PDFCS_DEVICECMYK) {
@@ skipping 501 matching lines @@
     if (!m_bCached) {
         if (m_pBitmap) {
             delete m_pBitmap;
             m_pBitmap = NULL;
         }
         if (m_pMask) {
             delete m_pMask;
         }
     }
 }