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xfree86: Take second reference for SavedCursor in xf86CursorSetCursor 

The same pointer is kept in CurrentCursor as well, therefore two
RefCursor calls are needed.

Fixes use-after-free after switching VTs.

Closes: xorg/xserver#1067
4 jobs for xfree86-SavedCursor-use-after-free in 4 minutes and 56 seconds (queued for 1 second)
919f1f46
1 related merge request: !504 xfree86: Take second reference for SavedCursor in xf86CursorSetCursor