e2fsck: ignore differing NEEDS_RECOVERY flag on backup sbs

e2fsck: ignore differing NEEDS_RECOVERY flag on backup sbs

When we resize online, the primary superblock gets copied to all
the backups, and of course since we're mounted the NEEDS_RECOVERY
flag is set.  A subsequent fsck will find the backups have the
NEEDS_RECOVERY flag set while the primary does not, and this
forces a full fsck pass.

I think this flag can be safely ignored in the flag comparisons.

Addresses-Red-Hat-Bugzilla: #471925

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