Avoid wrong memory access due to double substitution and %%

src/gpu/gl/builders/GrGLShaderStringBuilder.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrGLShaderStringBuilder.h"
 #include "gl/GrGLGpu.h"
 #include "gl/GrGLSLPrettyPrint.h"
@@ skipping 53 matching lines @@
 
         if (!compiled) {
             GrGLint infoLen = GR_GL_INIT_ZERO;
             GR_GL_CALL(gli, GetShaderiv(shaderId, GR_GL_INFO_LOG_LENGTH, &infoLen));
             SkAutoMalloc log(sizeof(char)*(infoLen+1)); // outside if for debugger
             if (infoLen > 0) {
                 // retrieve length even though we don't need it to workaround bug in Chromium cmd
                 // buffer param validation.
                 GrGLsizei length = GR_GL_INIT_ZERO;
                 GR_GL_CALL(gli, GetShaderInfoLog(shaderId, infoLen+1, &length, (char*)log.get()));
-                SkDebugf(GrGLSLPrettyPrint::PrettyPrintGLSL(strings, lengths, count, true).c_str());
+                SkDebugf("%s", GrGLSLPrettyPrint::PrettyPrintGLSL(strings, lengths, count, true).c_str());
                 SkDebugf("\n%s", log.get());
             }
             SkDEBUGFAIL("Shader compilation failed!");
             GR_GL_CALL(gli, DeleteShader(shaderId));
             return 0;
         }
     }
 
     if (c_PrintShaders) {
-        SkDebugf(GrGLSLPrettyPrint::PrettyPrintGLSL(strings, lengths, count, true).c_str());
+        SkDebugf("%s", GrGLSLPrettyPrint::PrettyPrintGLSL(strings, lengths, count, true).c_str());
         SkDebugf("\n");
     }
 
     // Attach the shader, but defer deletion until after we have linked the program.
     // This works around a bug in the Android emulator's GLES2 wrapper which
     // will immediately delete the shader object and free its memory even though it's
     // attached to a program, which then causes glLinkProgram to fail.
     GR_GL_CALL(gli, AttachShader(programId, shaderId));
 
     return shaderId;
 }