segfault with layout() after closing X11() device (PR#8970)

Full_Name: Don Maszle
Version: 2.3.0
OS: Solaris 9 - 64 bit compile
Submission from: (NULL) (206.86.87.3)


After closing an X11() window by either clicking on the close button
or by calling dev.off(), R 2.3.0 segfaults as shown below.  Calling layout()
before any X11() device is opened just opens a new device and applies the
layout.

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X11()
layout(matrix(1:2,1,2))
# close window with mouse, or call dev.off()
layout(matrix(1:2,1,2))

*** caught segfault ***
address 0, cause 'memory not mapped'

Traceback:
 1: X11()
 2: layout(matrix(1:2, 1, 2))