LU-16518 lnet: fix incorrectly initialized variables

LU-16518 lnet: fix incorrectly initialized variables

Clang 12 complained about an uninitialized 'off' in
brw_test.c, fixed by removing the dual declaration.

Also, init 'rc' in yaml_import_global_settings().

Test-Parameters: trivial
Signed-off-by: Timothy Day <timday@amazon.com>
Change-Id: I893149110120975c91839e73241b311a53c6e195
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/55084
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>