pad shader uniform length pipe by 1 to avoid a bug with some integrated chips clipping

Engine/source/gfx/gl/gfxGLShader.cpp

@@ -561,6 +561,7 @@ void GFXGLShader::initConstantDescs()
 
    if(!maxNameLength)
       return;
+   maxNameLength++;
 
    FrameTemp<GLchar> uniformName(maxNameLength);