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When os_persistent_file() is called without a directory set in the environment variable and the file isn't found in the current directory, also check in the executable's directory. This allows tests like dm_test_host to work when run directly from the build directory rather than through the pytest framework, avoiding the need to set U_BOOT_PERSISTENT_DATA_DIR manually. Co-developed-by: Claude Opus 4.5 <noreply@anthropic.com> Signed-off-by: Simon Glass <simon.glass@canonical.com>