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Introduce a separate function for the blit code and its vmap setup. Done in preparation of additional changes. No functional changes are made. v3: * Use drm_WARN_ONCE() with an error message to print warning v2: * print a single warning if damage blitter fails Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Sam Ravnborg <sam@ravnborg.org> Acked-by: Maxime Ripard <mripard@kernel.org> Link: https://patchwork.freedesktop.org/patch/msgid/20201120102545.4047-8-tzimmermann@suse.de