Add check to see if we need to remove fixed funciton VA in OptDrawState

src/gpu/GrOptDrawState.cpp

Index: src/gpu/GrOptDrawState.cpp
diff --git a/src/gpu/GrOptDrawState.cpp b/src/gpu/GrOptDrawState.cpp
index 40e0c6ce1fbb4a920caa8a2cf8874e5fd0b97544..77a9fc8dc454a25672d849f9ec8d5fb1f10c2081 100644
--- a/src/gpu/GrOptDrawState.cpp
+++ b/src/gpu/GrOptDrawState.cpp
@@ -48,7 +48,9 @@ GrOptDrawState::GrOptDrawState(const GrDrawState& drawState,
     this->adjustFromBlendOpts(drawState, &firstColorStageIdx, &firstCoverageStageIdx,
                               &fixedFunctionVAToRemove);
     // Should not be setting any more FFVA to be removed at this point
-    this->removeFixedFunctionVertexAttribs(fixedFunctionVAToRemove);
+    if (0 != fixedFunctionVAToRemove) {
+        this->removeFixedFunctionVertexAttribs(fixedFunctionVAToRemove);
+    }
     this->getStageStats(drawState, firstColorStageIdx, firstCoverageStageIdx);
     this->setOutputStateInfo(drawState, caps, firstCoverageStageIdx, &separateCoverageFromColor);