Prefer early bail-out.

Change-Id: I112a4be56910c07007b28715336fcd82d56bb313

sc/source/core/data/column3.cxx

@@ -1103,7 +1103,9 @@ ScAttrIterator* ScColumn::CreateAttrIterator( SCROW nStartRow, SCROW nEndRow ) c
 
 void ScColumn::StartAllListeners()
 {
-    if ( !maItems.empty() )
+    if (maItems.empty())
+        return;
+
     for (SCSIZE i = 0; i < maItems.size(); i++)
     {
         ScBaseCell* pCell = maItems[i].pCell;
@@ -1120,8 +1122,9 @@ void ScColumn::StartAllListeners()
 
 void ScColumn::StartNeededListeners()
 {
-    if ( !maItems.empty() )
-    {
+    if (maItems.empty())
+        return;
+
     for (SCSIZE i = 0; i < maItems.size(); i++)
     {
         ScBaseCell* pCell = maItems[i].pCell;
@@ -1137,7 +1140,6 @@ void ScColumn::StartNeededListeners()
             }
         }
     }
-    }
 }
 
 
@@ -1166,8 +1168,9 @@ void ScColumn::BroadcastInArea( SCROW nRow1, SCROW nRow2 )
 
 void ScColumn::StartListeningInArea( SCROW nRow1, SCROW nRow2 )
 {
-    if ( !maItems.empty() )
-    {
+    if (maItems.empty())
+        return;
+
     SCROW nRow;
     SCSIZE nIndex;
     Search( nRow1, nIndex );
@@ -1178,8 +1181,8 @@ void ScColumn::StartListeningInArea( SCROW nRow1, SCROW nRow2 )
             ((ScFormulaCell*)pCell)->StartListeningTo( pDocument );
         if ( nRow != maItems[nIndex].nRow )
             Search( nRow, nIndex ); // Inserted via Listening
-            nIndex++;
-        }
+
+        ++nIndex;
     }
 }