resize2fs: don't require fsck to print min size

resize2fs: don't require fsck to print min size

My previous change ended up requiring that the filesystem
be fsck'd after the last mount, even if we are only querying
the minimum size.  This is a bit draconian, and it burned
the Fedora installer, which wants to calculate minimum size
for every filesystem in the box at install time, which in turn
requires a full fsck of every filesystem.

Try this one more time, and separate out the tests to make things
a bit more clear.  If we're only printing the min size, don't
require the fsck, as this is a bit less dangerous/critical.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>