LU-6142 mdc: Fix style issues for mdc_request.c

LU-6142 mdc: Fix style issues for mdc_request.c

This patch fixes issues reported by checkpatch
for both files lustre/mdc/mdc_request.c

Test-Parameters: trivial
Signed-off-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Change-Id: Id1931d5b1b498e0a0971eb2a28c020bc5470da96
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/56480
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>