EX-9029 lfs: not iterate compr_type_table using ARRAY_SIZE

EX-9029 lfs: not iterate compr_type_table using ARRAY_SIZE

EX-8311 patch modifies compr_type_table to contain NULL fields in the
array, so iterate over the array should not use ARRAY_SIZE, but skip
those elements with NULL compression type name.

Fixes: ec5814c9a7 ("EX-8311 csdc: allow specify 'fast'/'best' compression type")
Signed-off-by: Bobi Jam <bobijam@whamcloud.com>
Change-Id: I8e4988fd3a63c1cb66f75510d190c2ebc4f8f9be
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/53808
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>