Fix uninitialized RGB in translating scanline

BUG=387841
R=palmer@chromium.org

Review URL: https://codereview.chromium.org/354363003

core/src/fpdfapi/fpdf_render/fpdf_render_loadimage.cpp

diff --git a/core/src/fpdfapi/fpdf_render/fpdf_render_loadimage.cpp b/core/src/fpdfapi/fpdf_render/fpdf_render_loadimage.cpp
index fa8827c..98efec1 100644
--- a/core/src/fpdfapi/fpdf_render/fpdf_render_loadimage.cpp
+++ b/core/src/fpdfapi/fpdf_render/fpdf_render_loadimage.cpp
@@ -992,7 +992,7 @@
     }
     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;