D25937: pic: Fix Invalid-enum-value undefined behaviour

[Albert Astals Cid]

aacid added a subscriber: security-team.

REPOSITORY
  R287 KImageFormats

REVISION DETAIL
  https://phabricator.kde.org/D25937

To: aacid
Cc: security-team, kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns
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