wined3d: context_validate_onscreen_formats() may modify context->render_offscreen.

I merged this by accident in be43c867a5fd06dc6b9f5b686abb22a1e17a712e.
diff --git a/dlls/wined3d/context.c b/dlls/wined3d/context.c
index d240686..ce20282 100644
--- a/dlls/wined3d/context.c
+++ b/dlls/wined3d/context.c
@@ -1992,6 +1992,8 @@
 {
     if (wined3d_settings.offscreen_rendering_mode == ORM_FBO)
     {
+        if (!context->render_offscreen) context_validate_onscreen_formats(device, context);
+
         if (context->render_offscreen)
         {
             FIXME("Applying blit state for an offscreen target with ORM_FBO. This should be avoided.\n");
@@ -2003,8 +2005,6 @@
         }
         else
         {
-            context_validate_onscreen_formats(device, context);
-
             ENTER_GL();
             context_bind_fbo(context, GL_FRAMEBUFFER, NULL);
             LEAVE_GL();
@@ -2077,9 +2077,10 @@
 
     if (wined3d_settings.offscreen_rendering_mode == ORM_FBO)
     {
+        if (!context->render_offscreen) context_validate_onscreen_formats(device, context);
+
         if (!context->render_offscreen)
         {
-            context_validate_onscreen_formats(device, context);
             ENTER_GL();
             context_apply_fbo_state(context, GL_FRAMEBUFFER, NULL, NULL);
             LEAVE_GL();