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cogl/cogl.c: Do not crash if GLX cannot be initialized

Marcin Cieślak requested to merge fix/793735 into master

Problems initializing OpenGL cause the following crash:

Program received signal SIGSEGV, Segmentation fault.
_cogl_check_extension (name=0x8239b9e00 "GLX_EXT_texture_from_pixmap",
                       ext=0x0)
    at cogl.c:75
75        while (*ext)

Fixes: https://bugzilla.gnome.org/show_bug.cgi?id=793735

Signed-off-by: Marcin Cieślak saper@saper.info

Edited by Marcin Cieślak

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