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Initialize roots_output to fix -Wmaybe-uninitialized
With -O2: ../rootston/desktop.c: In function ‘desktop_surface_at’: ../rootston/desktop.c:714:18: error: ‘roots_output’ may be used uninitialized in this function [-Werror=maybe-uninitialized] if ((surface = layer_surface_at(roots_output, ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ &roots_output->layers[ZWLR_LAYER_SHELL_V1_LAYER_BOTTOM], ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ox, oy, sx, sy))) { ~~~~~~~~~~~~~~~
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@ -682,7 +682,7 @@ struct wlr_surface *desktop_surface_at(struct roots_desktop *desktop,
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struct wlr_surface *surface = NULL;
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struct wlr_surface *surface = NULL;
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struct wlr_output *wlr_output =
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struct wlr_output *wlr_output =
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wlr_output_layout_output_at(desktop->layout, lx, ly);
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wlr_output_layout_output_at(desktop->layout, lx, ly);
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struct roots_output *roots_output;
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struct roots_output *roots_output = NULL;
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double ox = lx, oy = ly;
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double ox = lx, oy = ly;
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*view = NULL;
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*view = NULL;
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