D16534: [SMS App] Clean up runtime warning about undefined behavior

[Aleix Pol Gonzalez]

apol accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R224 KDE Connect

BRANCH
  anchor-warning

REVISION DETAIL
  https://phabricator.kde.org/D16534

To: sredman, apol
Cc: kdeconnect, skymoore, wistak, dvalencia, rmenezes, julioc, Leptopoda, timothyc, jdvr, yannux, Danial0_0, johnq, Pitel, adeen-s, SemperPeritus, daniel.z.tg, jeanv, seebauer, bugzy, MayeulC, menasshock, tctara, apol
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