(I found an amended version of this patch and applied the difference
here - keithp)
v3: Don't call Xsync before restoring error handler as any errors
generated by XGetImage() should be processed when this call
returns as suggested by Jamey Sharp <jamey@minilop.net>
Signed-off-by: Egbert Eich <eich@freedesktop.org>
Reviewed-by: Jamey Sharp <jamey@minilop.net>