Don't ref/unref the static src-over xp

src/gpu/gl/builders/GrGLProgramBuilder.cpp

Index: src/gpu/gl/builders/GrGLProgramBuilder.cpp
diff --git a/src/gpu/gl/builders/GrGLProgramBuilder.cpp b/src/gpu/gl/builders/GrGLProgramBuilder.cpp
index dc9393db0739ea04c5acd824c903d2eb8b6f7720..97fcce59b777313d690bc1d7d700529b67305e9f 100644
--- a/src/gpu/gl/builders/GrGLProgramBuilder.cpp
+++ b/src/gpu/gl/builders/GrGLProgramBuilder.cpp
@@ -93,7 +93,7 @@ bool GrGLProgramBuilder::emitAndInstallProcs(GrGLSLExpr4* inputColor, GrGLSLExpr
     this->emitAndInstallFragProcs(0, this->pipeline().numColorFragmentProcessors(), inputColor);
     this->emitAndInstallFragProcs(this->pipeline().numColorFragmentProcessors(), numProcs,
                                   inputCoverage);
-    this->emitAndInstallXferProc(*this->pipeline().getXferProcessor(), *inputColor, *inputCoverage,
+    this->emitAndInstallXferProc(this->pipeline().getXferProcessor(), *inputColor, *inputCoverage,
                                  this->pipeline().ignoresCoverage());
     return true;
 }