D8909: Fix uninitialized warning on valgrind

[Anthony Fieroni]

anthonyfieroni added a reviewer: drosca.

REPOSITORY
  R115 Plasma Audio Volume Applet

REVISION DETAIL
  https://phabricator.kde.org/D8909

To: apol, #plasma, drosca
Cc: plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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