EX-8042 lipe: Fix size calculation when using -blocks option

EX-8042 lipe: Fix size calculation when using -blocks option

This patch fixes the size calculation in the "-blocks"
option when specifying the exact size value "n[bkMG]".

Test-Parameters: trivial testlist=sanity-lipe-find3
Signed-off-by: Vitaliy Kuznetsov <vkuznetsov@ddn.com>
Change-Id: I5dd0ce69cef20ab9a9632798f350cf4c9f96cf25
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/53723
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>