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len and remain can never be negative in gdm_tty_write(). So remove such a check and move the check of remaining bytes to the loop condition. This way, the preceding 'if' is now superfluous too. Fix all that and make the code cleaner. Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org> Reported-by: Dan Carpenter <dan.carpenter@linaro.org> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Cc: linux-staging@lists.linux.dev Link: https://lore.kernel.org/r/20230810103900.19353-1-jirislaby@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>