D9732: Fix for xembedsniproxy crash due to NULL returned from xcb_image_get()

[Maciej Sitarz]

maciejsitarz created this revision.
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REVISION SUMMARY
  In my environment (Fedora 27, plasma-workspace-5.11.4-1.fc27.x86_64) xembedsniproxy crashes.
  This is caused by NULL being returned by xcb_image_get().
  
  This should fix or at least mitigate the problems from bugs:
  https://bugs.kde.org/show_bug.cgi?id=355463
  https://bugs.kde.org/show_bug.cgi?id=359664
  https://bugzilla.redhat.com/show_bug.cgi?id=1497829

REPOSITORY
  R120 Plasma Workspace

REVISION DETAIL
  https://phabricator.kde.org/D9732

AFFECTED FILES
  xembed-sni-proxy/sniproxy.cpp

To: maciejsitarz
Cc: plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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