modes: check the crtc is valid before using its desired modes.
this fixes a crash I was getting on radeon rotate when gnome is running. I'm sure g-s-d was doing something bad, but really not crashing ftw.
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@ -1714,9 +1714,11 @@ xf86SetScrnInfoModes (ScrnInfoPtr scrn)
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/* Set scrn->modes to the mode list for the 'compat' output */
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scrn->modes = xf86DuplicateModes(scrn, output->probed_modes);
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for (mode = scrn->modes; mode; mode = mode->next)
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if (xf86ModesEqual (mode, &crtc->desiredMode))
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break;
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if (crtc) {
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for (mode = scrn->modes; mode; mode = mode->next)
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if (xf86ModesEqual (mode, &crtc->desiredMode))
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break;
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}
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if (scrn->modes != NULL) {
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/* For some reason, scrn->modes is circular, unlike the other mode
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