i3 - improved tiling WM

Use cairo_status_to_string for descriptive errors.

Patch status: merged

Patch by Bas Pape

To apply this patch, use:
curl http://cr.i3wm.org/patch/198/raw.patch | git am

b/i3lock.c

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@@ -657,8 +657,8 @@ int main(int argc, char *argv[]) {
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         img = cairo_image_surface_create_from_png(image_path);
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         /* In case loading failed, we just pretend no -i was specified. */
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         if (cairo_surface_status(img) != CAIRO_STATUS_SUCCESS) {
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-            fprintf(stderr, "Could not load image \"%s\": cairo surface status %d\n",
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-                    image_path, cairo_surface_status(img));
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+            fprintf(stderr, "Could not load image \"%s\": %s\n",
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+                    image_path, cairo_status_to_string(cairo_surface_status(img)));
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             img = NULL;
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         }
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     }