Some trivial -fsanitize=undefined adaptions

Change-Id: I60f6e2b5f041919319cb6b72684b8b7b8504560c

rsc/inc/rscdef.hxx

@@ -63,7 +63,7 @@ public:
     sal_Int32 GetLong() const
                   {
                       return aExp.aLong.nLo |
-                          ((sal_Int32)aExp.aLong.nHi << 16);
+                          ((sal_uInt32)aExp.aLong.nHi << 16);
                   }
     bool Evaluate( sal_Int32 * pValue ) const;
     void AppendMacro( OStringBuffer & ) const;

rsc/source/rscpp/cpp5.c

@@ -291,16 +291,15 @@ again:  ;
         }
         opp->op = (char)op;
         opp->prec = (char)prec;
-        skip = (valp[-1] != 0);     /* Short-circuit tester */
         /*
          * Do the short-circuit stuff here.  Short-circuiting
          * stops automagically when operators are evaluated.
          */
-        if ((op == OP_ANA && !skip)
-         || (op == OP_ORO && skip))
+        if ((op == OP_ANA && valp[-1] == 0)
+         || (op == OP_ORO && valp[-1] != 0))
             opp->skip = S_ANDOR;    /* And/or skip starts   */
         else if (op == OP_QUE)      /* Start of ?: operator */
-            opp->skip = (char)((op1 & S_ANDOR) | ((!skip) ? S_QUEST : 0));
+            opp->skip = (char)((op1 & S_ANDOR) | ((valp[-1] == 0) ? S_QUEST : 0));
         else if (op == OP_COL) {    /* : inverts S_QUEST    */
             opp->skip = (char)((op1 & S_ANDOR)
                   | (((op1 & S_QUEST) != 0) ? 0 : S_QUEST));