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Commit 51bb33846ad2 ("bootm: Support string substitution in bootargs") introduced a feature of bootargs string substitution and changed a flag used in bootm_process_cmdline_env() call to be either true or false. With this flag value, condition in bootm_process_cmdline() `if (flags & BOOTM_CL_SUBST)` is never true and process_subst() is never called. Add a simple test to verify if substitution works OK. Signed-off-by: Piotr Kubik <piotr.kubik@iopsys.eu> Reviewed-by: Simon Glass <sjg@chromium.org>