e2fsck: Count the root directory as found if it has shared blocks in pass1c

e2fsck: Count the root directory as found if it has shared blocks in pass1c

Another small bug I think: if the root directory contains shared
blocks, e2fsck pass1c search_dirent_proc() will be looking for
one more containing directory than it will ever find, and thus
loses an opportunity to terminate early.

Signed-off-by: Jim Garlick <garlick@llnl.gov>