backend/drm: avoid creating empty FB_DAMAGE_CLIPS prop
drmModeCreatePropertyBlob cannot create zero-sized blobs, that fails with EINVAL. Closes: https://github.com/swaywm/wlroots/issues/3297
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@ -201,6 +201,7 @@ static bool atomic_crtc_commit(struct wlr_drm_connector *conn,
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uint32_t fb_damage_clips = 0;
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if ((state->base->committed & WLR_OUTPUT_STATE_DAMAGE) &&
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pixman_region32_not_empty((pixman_region32_t *)&state->base->damage) &&
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crtc->primary->props.fb_damage_clips != 0) {
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int rects_len;
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const pixman_box32_t *rects = pixman_region32_rectangles(
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