LU-16518 utils: fix clang build errors

LU-16518 utils: fix clang build errors

This patch fixes a number of small clang build
errors in Lustre utils. Many errors are related
to nuances in typing or statements which appear
to be tautologies. These are resolved.

Some unneeded paranthesis are removed. A variable
is initialized which could potentially be left
uninitialized. And a comparison was added that
seemed to be left out.

Lustre-change: https://review.whamcloud.com/50161
Lustre-commit: 632dc6729abcaf83aeaef8167a73ce18b9a41a67

Signed-off-by: Timothy Day <timday@amazon.com>
Change-Id: Id3f40b033e640f8d2ae6386f66a88de06fc89666
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Sebastien Buisson <sbuisson@ddn.com>
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/53042
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Andreas Dilger <adilger@whamcloud.com>