D28062: Fix compiler warnings

[Aleix Pol Gonzalez]

apol added inline comments.

INLINE COMMENTS

> zzag wrote in screenshot.cpp:661
> Do compilers bark about using c-style casts?

The warning is:
`kwin/effects/screenshot/screenshot.cpp:671:23: warning: cast from 'uchar *' (aka 'unsigned char *') to 'uint *' (aka 'unsigned int *') increases required alignment from 1 to 4 [-Wcast-align]`

REPOSITORY
  R108 KWin

REVISION DETAIL
  https://phabricator.kde.org/D28062

To: apol, #kwin
Cc: zzag, kwin, Orage, cacarry, LeGast00n, The-Feren-OS-Dev, cblack, jraleigh, zachus, fbampaloukas, GB_2, mkulinski, ragreen, jackyalcine, iodelay, crozbo, bwowk, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, hardening, romangg, jensreuterberg, abetts, sebas, apol, ahiemstra, mart
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