[HttpFoundation] Fix PHP 8.1 deprecation notice in IpUtils::checkIp()#43357

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fabpot merged 1 commit intosymfony:4.4from

W0rma:43350-php81-iputils

Oct 10, 2021

Commits on Oct 7, 2021

Do not call substr_count() if ip is null to avoid deprecation warning in PHP 8.1
W0rma
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