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Unify with the rest of the code. Use size_t for counts and ssize_t for
retval.
Signed-off-by: "Jiri Slaby (SUSE)" <jirislaby@kernel.org>
Link: https://lore.kernel.org/r/20230810091510.13006-30-jirislaby@kernel.org

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>