Apply the depth texture correctly as the DepthStencil surface in applyRenderTarget

Trac #20875
Signed-off-by: Nicolas Capens

git-svn-id: https://angleproject.googlecode.com/svn/trunk@1115 736b8ea6-26fd-11df-bfd4-992fa37f6226
diff --git a/src/libGLESv2/utilities.cpp b/src/libGLESv2/utilities.cpp
index 3b77cd8..d34c665 100644
--- a/src/libGLESv2/utilities.cpp
+++ b/src/libGLESv2/utilities.cpp
@@ -795,6 +795,7 @@
 {
     switch (format)
     {
+      case GL_NONE:                 return D3DFMT_NULL;
       case GL_RGBA4:
       case GL_RGB5_A1:
       case GL_RGBA8_OES:            return D3DFMT_A8R8G8B8;