coverity#1436015 UNUSED_VALUE

I got to know that, earlier the code I've submitted about line algorithm
creates error. I've fixed that in this patch. Moreover, child width and
height doesn't depend of nIncX and nIncY, so I've removed that code, it
relates only to the position of the child.

Change-Id: I9f4bdec87fc20340c21daed60246b9898967ab50
Reviewed-on: https://gerrit.libreoffice.org/55564Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

oox/source/drawingml/diagram/diagramlayoutatoms.cxx

@@ -356,15 +356,9 @@ void AlgAtom::layoutShape( const ShapePtr& rShape,
             double fSpace = 0.3;
 
             awt::Size aChildSize = rShape->getSize();
-            if (nIncX)
-                aChildSize.Width /= (nCount + (nCount-1)*fSpace);
-            if (nIncY)
-                aChildSize.Height /= (nCount + (nCount-1)*fSpace);
 
-            if(nCount <= 2 && nIncY)
-                aChildSize.Height /= 2;
-            else
-                aChildSize.Height /= (nCount+1);
+            aChildSize.Width /= (nCount + (nCount-1)*fSpace);
+            aChildSize.Height /= (nCount + (nCount-1)*fSpace);
 
             awt::Point aCurrPos(0, 0);
             if (nIncX == -1)
@@ -372,11 +366,6 @@ void AlgAtom::layoutShape( const ShapePtr& rShape,
             if (nIncY == -1)
                 aCurrPos.Y = rShape->getSize().Height - aChildSize.Height;
 
-            if(nCount <= 2 && nIncY == -1)
-                aCurrPos.Y = rShape->getSize().Height - aChildSize.Height*2;
-            else
-                aCurrPos.Y = rShape->getSize().Height - aChildSize.Height*(nCount+1);
-
             for (auto & aCurrShape : rShape->getChildren())
             {
                 aCurrShape->setPosition(aCurrPos);