generic/192: fix instability on exFAT

exFAT's access time has 2s granularity and is rounded down.

This can cause problems, e.g.:

	if real access times are: time1=2 and time2=7, then 7 - 2 = 5;
	but exfat_atime(7) - exfat_atime(2) => 6 - 2 = 4 which is less
	than expected delay.

To fix this, even (delay - 1s) should be considered as a valid result
for exFAT.

Signed-off-by: Pavel Reichl <preichl@redhat.com>
Reviewed-by: Eryu Guan <guaneryu@gmail.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>
1 file changed