Fix some warnings

Review URL: http://codereview.appspot.com/5075049/



git-svn-id: http://skia.googlecode.com/svn/trunk@2304 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gpu/src/GrGLProgram.cpp b/gpu/src/GrGLProgram.cpp
index 0c707c5..015be61 100644
--- a/gpu/src/GrGLProgram.cpp
+++ b/gpu/src/GrGLProgram.cpp
@@ -515,7 +515,7 @@
 
     // the dual source output has no canonical var name, have to
     // declare an output, which is incompatible with gl_FragColor/gl_FragData.
-    const char* fsColorOutput;
+    const char* fsColorOutput = NULL;
     bool dualSourceOutputWritten = false;
     segments.fHeader.printf(glsl_version_string(gl, glslVersion));
     bool isColorDeclared = decl_and_get_fs_color_output(glslVersion,