More plausible fix

...for 7c465e7f "coverity#1326260 Explicit null
dereferenced"

Change-Id: I3b7fb8195c29b7e447fbe31f823cd00d7a820e95

nlpsolver/src/com/sun/star/comp/Calc/NLPSolver/BaseNLPSolver.java

@@ -246,8 +246,10 @@ public abstract class BaseNLPSolver extends WeakBase
         RowInfo currentRow = null;
         int lastSheet = -1, lastRow = -1;
         for (int i = 0; i < m_variableCount; i++) {
-            if (lastSheet == m_variables[i].Sheet && lastRow == m_variables[i].Row &&
-                    currentRow != null && currentRow.EndCol == m_variables[i].Column - 1)
+            boolean match = lastSheet == m_variables[i].Sheet &&
+                lastRow == m_variables[i].Row;
+            assert !match || currentRow != null;
+            if (match && currentRow.EndCol == m_variables[i].Column - 1)
                 currentRow.EndCol++;
             else {
                 currentRow = new RowInfo(m_variables[i].Sheet, m_variables[i].Row);