e2fsck: allow verity files to have initialized blocks past i_size

e2fsck: allow verity files to have initialized blocks past i_size

Since ext4 verity is going to be an RO_COMPAT feature rather than an
INCOMPAT one, the on-disk i_size of verity inodes needs to be the data
size rather than the full size.  Consequently, verity inodes will have
initialized blocks past i_size, containing the Merkle tree and other
verity metadata.  So e2fsck must not fix the i_size of such inodes as it
normally would.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>