return early on no-op cases, no logic change

Change-Id: I7041ac2268d1df8b37e380ccde926d5aec06510e

sw/source/uibase/frmdlg/colex.cxx

@@ -210,15 +210,18 @@ void SwColExample::DrawPage(vcl::RenderContext& rRenderContext, const Point& rOr
                             const bool bSecond, const bool bEnabled)
 {
     SwPageExample::DrawPage(rRenderContext, rOrg, bSecond, bEnabled);
-    sal_uInt16 nColumnCount;
-    if (pColMgr && 0 != (nColumnCount = pColMgr->GetCount()))
-    {
+    if (!pColMgr)
+        return;
+    sal_uInt16 nColumnCount = pColMgr->GetCount();
+    if (!nColumnCount)
+        return;
+
     long nL = GetLeft();
     long nR = GetRight();
 
     if (GetUsage() == SVX_PAGE_MIRROR && !bSecond)
     {
-            // rotate for mirrored
+        // swap for mirrored
         nL = GetRight();
         nR = GetLeft();
     }
@@ -254,14 +257,12 @@ void SwColExample::DrawPage(vcl::RenderContext& rRenderContext, const Point& rOr
     if (bAutoWidth)
     {
         sal_Int32 nColumnWidthSum = 0;
-            sal_uInt16 i;
-            for (i = 0; i < nColumnCount; ++i)
+        for (sal_uInt16 i = 0; i < nColumnCount; ++i)
             nColumnWidthSum += pColMgr->GetColWidth( i );
         nAutoColWidth = nColumnWidthSum / nColumnCount;
     }
 
-        sal_uInt16 i;
-        for (i = 0; i < nColumnCount; i++)
+    for (sal_uInt16 i = 0; i < nColumnCount; ++i)
     {
         if (!bAutoWidth)
             nAutoColWidth = pColMgr->GetColWidth(i);
@@ -295,7 +296,7 @@ void SwColExample::DrawPage(vcl::RenderContext& rRenderContext, const Point& rOr
             }
         }
 
-            for (i = 0; i < nColumnCount -  1; i++)
+        for (sal_uInt16 i = 0; i < nColumnCount -  1; ++i)
         {
             int nGutter = pColMgr->GetGutterWidth(i);
             int nDist = pColMgr->GetColWidth( i ) + nGutter;
@@ -305,7 +306,6 @@ void SwColExample::DrawPage(vcl::RenderContext& rRenderContext, const Point& rOr
             rRenderContext.DrawLine(aUp, aDown);
         }
     }
-    }
 }
 
 VCL_BUILDER_FACTORY(SwColExample)