EX-7775 utils: fix LL_COMPR_TYPE wire checks

EX-7775 utils: fix LL_COMPR_TYPE wire checks

Fix LL_COMPR_TYPE* wire checks to avoid duplication.
The value of LL_COMPR_TYPE_UNCHANGED is also declared as 15 so that
is does not conflict with other potential real compression types in
the future.

Fixes: 67d4601737 ("EX-6249 csdc: set compress component for file")
Test-Parameters: trivial
Signed-off-by: Sebastien Buisson <sbuisson@ddn.com>
Change-Id: Iab9830f09f0778e1e1f3b1ea4c9878ce1017de8d
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/51473
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>