Fixed compiler warning C4456 'declaration of variable hides previous local declaration'.

BUG=angleproject:1119

Change-Id: I99572711ceeae94fb920d197c86e741945d3b60b
Reviewed-on: https://chromium-review.googlesource.com/292279
Tested-by: Cooper Partin <coopp@microsoft.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
diff --git a/src/libANGLE/renderer/gl/VertexArrayGL.cpp b/src/libANGLE/renderer/gl/VertexArrayGL.cpp
index f345ab1..a2ca881 100644
--- a/src/libANGLE/renderer/gl/VertexArrayGL.cpp
+++ b/src/libANGLE/renderer/gl/VertexArrayGL.cpp
@@ -132,8 +132,8 @@
     {
         ASSERT(attributesNeedStreaming);
 
-        gl::Error error = streamAttributes(activeAttribLocations, streamingDataSize, maxAttributeDataSize,
-                                           indexRange);
+        error = streamAttributes(activeAttribLocations, streamingDataSize, maxAttributeDataSize,
+                                 indexRange);
         if (error.isError())
         {
             return error;