If there is no space for a checksum in a directory leaf node,
previously we would use EXT4_ERROR_INODE() which would mark the file
system as inconsistent.  While it would be nice to use e2fsck -D, it
certainly isn't required, so just print a warning using
ext4_warning().
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: "Darrick J. Wong" <darrick.wong@oracle.com>