Removed check that width == height for cube maps during SubImage call.

TRAC #22956

Signed-off-by: Jamie Madill
Signed-off-by: Shannon Woods
Author: Geoff Lang

git-svn-id: https://angleproject.googlecode.com/svn/branches/es3proto@2358 736b8ea6-26fd-11df-bfd4-992fa37f6226
diff --git a/src/libGLESv2/libGLESv2.cpp b/src/libGLESv2/libGLESv2.cpp
index ed30736..5a8f07e 100644
--- a/src/libGLESv2/libGLESv2.cpp
+++ b/src/libGLESv2/libGLESv2.cpp
@@ -624,7 +624,7 @@
       case GL_TEXTURE_CUBE_MAP_POSITIVE_Z:
       case GL_TEXTURE_CUBE_MAP_NEGATIVE_Z:
         {
-            if (width != height)
+            if (!isSubImage && width != height)
             {
                 return gl::error(GL_INVALID_VALUE, false);
             }