io: Adapt to >= 64-bit time_t

io: Adapt to >= 64-bit time_t

We now require (at least) 64-bit time_t, so we need to adjust some printf
specifiers accordingly.

Unfortunately, we've stumbled upon a ridiculous C mmoment whereby there's
no neat format specifier (not even one of the inttypes ones) for time_t, so
we cast to intmax_t and use %jd.

Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sam James <sam@gentoo.org>
Signed-off-by: Carlos Maiolino <cem@kernel.org>