make sure it is really the glGenTextures call

that one is actually not allowed to create a GL_INVALID_OPERATION in
OpenGL 3.3+

Change-Id: I853c63cfd7a30d4f61e562082cc24959c0fe6c07

chart2/source/view/main/OpenGLRender.cxx

@@ -1509,6 +1509,7 @@ int OpenGLRender::CreateTextTexture(::rtl::OUString textValue, sal_uInt32 color,
 
     }
 
+    CHECK_GL_ERROR();
     glGenTextures(1, &m_TextInfo.texture);
     CHECK_GL_ERROR();
     glBindTexture(GL_TEXTURE_2D, m_TextInfo.texture);