fix for use of uninit variable

src/gpu/GrBitmapTextContext.cpp

Index: src/gpu/GrBitmapTextContext.cpp
diff --git a/src/gpu/GrBitmapTextContext.cpp b/src/gpu/GrBitmapTextContext.cpp
index f22b7608a6796d711a82f93bdfe09004663af4f7..2ff410e5cf278ca6b89c58e382c44af8b22f1720 100755
--- a/src/gpu/GrBitmapTextContext.cpp
+++ b/src/gpu/GrBitmapTextContext.cpp
@@ -548,12 +548,12 @@ void GrBitmapTextContext::flush() {
         return;
     }
 
-    GrDrawState drawState;
-    drawState.setFromPaint(fPaint, SkMatrix::I(), fContext->getRenderTarget());
+    if (fCurrVertex > 0) {
+        GrDrawState drawState;
+        drawState.setFromPaint(fPaint, SkMatrix::I(), fContext->getRenderTarget());
 
-    set_vertex_attributes(&drawState, fCurrMaskFormat);
+        set_vertex_attributes(&drawState, fCurrMaskFormat);
 
-    if (fCurrVertex > 0) {
         // setup our sampler state for our text texture/atlas
         SkASSERT(SkIsAlign4(fCurrVertex));
         SkASSERT(fCurrTexture);