LU-6142 mdt: Fix style issues for mdt_lib.c

LU-6142 mdt: Fix style issues for mdt_lib.c

This patch fixes issues reported by checkpatch
for file lustre/mdt/mdt_lib.c

Test-Parameters: trivial
Signed-off-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Change-Id: I04b1cb3c993f229c83e7f54a13e03ae6a957aa49
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/54230
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Timothy Day <timday@amazon.com>
Reviewed-by: jsimmons <jsimmons@infradead.org>
Reviewed-by: Jian Yu <yujian@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>