Bug#776371: x11-utils: xwininfo segfaults when given invalid screen number

[Frank Heckenbach <f.heckenbach@fh-soft.de>]

Package: x11-utils
Version: 7.7~1
Severity: normal

xwininfo segfaults when given an invalid screen number:

% DISPLAY=:0.100 xwininfo -root
xwininfo: Please select the window about which you
          would like information by clicking the
          mouse in that window.
Segmentation fault

Unlike an invalid display number:

% DISPLAY=:100.0 xwininfo -root
xwininfo: error: unable to open display ":100.0"