Backport r957666 by tmcguire from trunk to the 4.2 branch:

Merged revisions 953652 via svnmerge from 
svn+ssh://tmcguire@svn.kde.org/home/kde/branches/kdepim/enterprise4/kdepim

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  r953652 | winterz | 2009-04-14 14:59:59 +0200 (Tue, 14 Apr 2009) | 10 lines
  
  Merged revisions 953518 via svnmerge from 
  https://svn.kde.org/home/kde/branches/kdepim/enterprise/kdepim
  
  ........
    r953518 | mlaurent | 2009-04-14 04:29:56 -0400 (Tue, 14 Apr 2009) | 3 lines
    
    Fix mem leak.
    Necessary to port it to e4/kde4.2/trunk.
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svn path=/branches/KDE/4.2/kdepim/; revision=957731

kmreaderwin.cpp

@@ -2264,6 +2264,7 @@ void KMReaderWin::setMsgPart( KMMessagePart* aMsgPart, bool aHTML,
       htmlWriter()->end();
       setWindowTitle( i18n("View Attachment: %1", pname ) );
       show();
+      delete iio;
   } else {
     htmlWriter()->begin( mCSSHelper->cssDefinitions( isFixedFont() ) );
     htmlWriter()->queue( mCSSHelper->htmlHead( isFixedFont() ) );