xwayland: Don't (double) destroy RANDR resources in CloseScreen

By the time we get here we've already been through FreeAllResources,
which has already torn down the RANDR objects, so on the second
regeneration you get:

    Invalid read of size 4
       at 0x51C6F0: RRCrtcDestroy (rrcrtc.c:659)
       by 0x4285F5: xwl_output_destroy (xwayland-output.c:191)
       by 0x426464: xwl_close_screen (xwayland.c:112)
       by 0x4B7F77: CursorCloseScreen (cursor.c:187)
       by 0x536013: AnimCurCloseScreen (animcur.c:106)
       by 0x539841: present_close_screen (present_screen.c:64)
       by 0x43E496: dix_main (main.c:351)
       by 0x30D70206FF: (below main) (libc-start.c:289)
     Address 0x4cc6640 is 0 bytes inside a block of size 728 free'd
       at 0x4A07D6A: free (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
       by 0x51BCCF: RRCrtcDestroyResource (rrcrtc.c:689)
       by 0x45CD91: doFreeResource (resource.c:872)
       by 0x45DE56: FreeClientResources (resource.c:1138)
       by 0x45DF06: FreeAllResources (resource.c:1153)
       by 0x43E3BD: dix_main (main.c:321)
       by 0x30D70206FF: (below main) (libc-start.c:289)

Signed-off-by: Adam Jackson <ajax@redhat.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
Signed-off-by: Keith Packard <keithp@keithp.com>
(cherry picked from commit 11f4cc47a8)

hw/xwayland/xwayland-output.c

@@ -188,8 +188,6 @@ void
 xwl_output_destroy(struct xwl_output *xwl_output)
 {
     wl_output_destroy(xwl_output->output);
-    RRCrtcDestroy(xwl_output->randr_crtc);
-    RROutputDestroy(xwl_output->randr_output);
     free(xwl_output);
 }