Fix uninitialized nresults and RGB

core/src/fpdfapi/fpdf_render/fpdf_render_pattern.cpp

Index: core/src/fpdfapi/fpdf_render/fpdf_render_pattern.cpp
diff --git a/core/src/fpdfapi/fpdf_render/fpdf_render_pattern.cpp b/core/src/fpdfapi/fpdf_render/fpdf_render_pattern.cpp
index 4b4f929179042f9f97e9381e83d781e16aeebbca..0bf6311b1906d18da099b61c645658af5fc9dab9 100644
--- a/core/src/fpdfapi/fpdf_render/fpdf_render_pattern.cpp
+++ b/core/src/fpdfapi/fpdf_render/fpdf_render_pattern.cpp
@@ -710,7 +710,7 @@ static void _DrawCoonPatchMeshes(FX_BOOL bTensor, CFX_DIBitmap* pBitmap, CFX_Aff
             pObject2Bitmap->Transform(coords[i].x, coords[i].y);
         }
         for (i = iStartColor; i < 4; i ++) {
-            FX_FLOAT r, g, b;
+            FX_FLOAT r=0.0f, g=0.0f, b=0.0f;
             stream.GetColor(r, g, b);
             patch.patch_colors[i].comp[0] = (FX_INT32)(r * 255);
             patch.patch_colors[i].comp[1] = (FX_INT32)(g * 255);