xfs: test fstat with malformed inode mode

xfs: test fstat with malformed inode mode

In addition to testing xfs_repair on inodes with malformed mode,
also test fstat of those inodes on a mounted fs.

This additional test is quite noisy with dmesg warnings, so
check dmesg has been disabled.

This test fails on kernel 4.9 because a zero size inode is not
identified as malformed dir. A patch has been sent to fix this
("xfs: sanity check directory inode di_size").

This test may be merged before the fix patch.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>