tune2fs: Fix overflow of interval check

Add the check of maximum check interval.
s_checkinterval is 32bit variable, so it cannot be set more than 2^32.

Signed-off-by: Kazuya Mio <k-mio@sx.jp.nec.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
1 file changed