SVN_SILENT don't allocate a matrix in the rare case there's no need for it

svn path=/trunk/KDE/kdegraphics/okular/; revision=688310

core/rotationjob.cpp

@@ -45,13 +45,13 @@ PagePrivate * RotationJob::page() const
 
 void RotationJob::run()
 {
-    QMatrix matrix;
-
     if ( mOldRotation == mNewRotation ) {
         mRotatedImage = mImage;
         return;
     }
 
+    QMatrix matrix;
+
     if ( mOldRotation == Rotation0 ) {
         if ( mNewRotation == Rotation90 )
             matrix.rotate( 90 );