Small fix for RODrawState

BUG=skia:
R=egdaniel@google.com, joshualitt@google.com

Author: joshualitt@chromium.org

Review URL: https://codereview.chromium.org/545273002
diff --git a/src/gpu/GrRODrawState.cpp b/src/gpu/GrRODrawState.cpp
index f6a2355..2f02482 100644
--- a/src/gpu/GrRODrawState.cpp
+++ b/src/gpu/GrRODrawState.cpp
@@ -40,14 +40,14 @@
     bool explicitLocalCoords = this->hasLocalCoordAttribute();
     if (this->hasGeometryProcessor()) {
         if (!that.hasGeometryProcessor()) {
-            return kIncompatible_CombinedState;
+            return false;
         } else if (!GrEffectStage::AreCompatible(*this->getGeometryProcessor(),
                                                  *that.getGeometryProcessor(),
                                                  explicitLocalCoords)) {
-            return kIncompatible_CombinedState;
+            return false;
         }
     } else if (that.hasGeometryProcessor()) {
-        return kIncompatible_CombinedState;
+        return false;
     }
 
     for (int i = 0; i < this->numColorStages(); i++) {