Fix uninitialized string bug

src/gpu/gl/GrGLEffectMatrix.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrGLEffectMatrix.h"
 #include "GrDrawEffect.h"
 #include "GrTexture.h"
@@ skipping 40 matching lines @@
     // TODO: Handle vertexless shaders here before we start enabling them.
     GrGLShaderBuilder::VertexBuilder* vertexBuilder = builder->getVertexBuilder();
     SkASSERT(NULL != vertexBuilder);
 
     GrSLType varyingType = kVoid_GrSLType;
     const char* uniName;
     key &= kKeyMask;
     switch (key & kMatrixTypeKeyMask) {
         case kIdentity_MatrixType:
             fUniType = kVoid_GrSLType;
+            uniName = NULL;
             varyingType = kVec2f_GrSLType;
             break;
         case kTrans_MatrixType:
             fUniType = kVec2f_GrSLType;
             uniName = "StageTranslate";
             varyingType = kVec2f_GrSLType;
             break;
         case kNoPersp_MatrixType:
             fUniType = kMat33f_GrSLType;
             uniName = "StageMatrix";
             varyingType = kVec2f_GrSLType;
             break;
         case kGeneral_MatrixType:
             fUniType = kMat33f_GrSLType;
             uniName = "StageMatrix";
             varyingType = kVec3f_GrSLType;
             break;
         default:
             GrCrash("Unexpected key.");
     }
     SkString suffixedUniName;
-    if (NULL != suffix) {
-        suffixedUniName.append(uniName);
-        suffixedUniName.append(suffix);
-        uniName = suffixedUniName.c_str();
-    }
     if (kVoid_GrSLType != fUniType) {
+        if (NULL != suffix) {
+            suffixedUniName.append(uniName);
+            suffixedUniName.append(suffix);
+            uniName = suffixedUniName.c_str();
+        }
         fUni = builder->addUniform(GrGLShaderBuilder::kVertex_Visibility,
                                    fUniType,
                                    uniName,
                                    &uniName);
     }
 
     const char* varyingName = "MatrixCoord";
     SkString suffixedVaryingName;
     if (NULL != suffix) {
         suffixedVaryingName.append(varyingName);
@@ skipping 134 matching lines @@
             if (!fPrevMatrix.cheapEqualTo(combined)) {
                 uniformManager.setSkMatrix(fUni, combined);
                 fPrevMatrix = combined;
             }
             break;
         }
         default:
             GrCrash("Unexpected uniform type.");
     }
 }