fs/dlm/dir: remove unuse variable count_match

fs/dlm/dir: remove unuse variable count_match

The variable was never used after introduced. Better to comment it if we
want to keep the info.

fs/dlm/dir.c:65:26: error: variable 'count_match' set but not used [-Werror,-Wunused-but-set-variable]
   65 |         unsigned int count = 0, count_match = 0, count_bad = 0, count_add = 0;
      |                                 ^
1 error generated.

Signed-off-by: Alex Shi <alexs@kernel.org>
Signed-off-by: Alexander Aring <aahringo@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>