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The cmd_exit() function used -EINTR to signal a clean exit from the interactive mode. This is semantically incorrect because EINTR is an errno value meant for system call interruptions, not application-level control flow. Stop using -EINTR for cmd_exit(). Introduce ISOBUSFS_CLI_RET_EXIT (a positive return code) to distinguish control flow from actual errors. Map this to exit code 0 in main(), keeping negative errno values for real errors. This makes the exit path explicit and prevents confusion with actual interrupted system calls. Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>