D28889: Avoid crash in KWin::DrmOutput::updateCursor

meven added inline comments.

INLINE COMMENTS

> drm_output.cpp:90
>  
> -    delete m_cursor[0];
> -    delete m_cursor[1];
> +    delete[] m_cursor;
>      if (!m_pageFlipPending) {

I replace those deletes, as they did not delete the m_cursor array and allowed m_cursor[i] to keep dangling pointers causing down the line crash in QImage rather than a proper segfault where m_cursor[i] was used.

REPOSITORY
  R108 KWin

BRANCH
  arcpatch-D28889

REVISION DETAIL
  https://phabricator.kde.org/D28889

To: meven, #kwin, zzag, davidedmundson
Cc: ngraham, apol, kwin, Orage, cacarry, LeGast00n, The-Feren-OS-Dev, cblack, jraleigh, zachus, fbampaloukas, mkulinski, ragreen, jackyalcine, iodelay, crozbo, bwowk, ZrenBot, alexeymin, himcesjf, lesliezhai, ali-mohamed, hardening, romangg, jensreuterberg, abetts, sebas, ahiemstra, mart