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xcat-core/perl-xCAT/xCAT
Vinícius Ferrão 5cfd7b3428 fix(NetworkUtils): guard formatNetmask against an undefined mask
formatNetmask() uses its first argument immediately (inet_aton($mask),
2**$mask, hex $mask) with no check that it is defined. Callers that pass an
undefined mask trigger "Use of uninitialized value" warnings and a
meaningless result instead of a clean failure.

Return undef up front when $mask is not defined.

Recovered from the unmerged lenovobuild branch (original acbbeb86).

Co-authored-by: Jarrod Johnson <10814490+jjohnson42@users.noreply.github.com>
(cherry picked from commit 2d294ae8f7)
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