CONNECT: accessed p[i] outside of the loop

this failed json.test on fulltest2 builder

storage/connect/value.cpp

@@ -1655,9 +1655,11 @@ bool TYPVAL<PSZ>::Compute(PGLOBAL g, PVAL *vp, int np, OPVAL op)
   int   i;
 
   for (i = 0; i < np; i++)
-    p[i] = vp[i]->IsNull() ? NULL : vp[i]->GetCharString(val[i]);
+    if (vp[i]->IsNull())
+      return false;
+    else
+      p[i] = vp[i]->GetCharString(val[i]);
 
-	if (p[i]) {
   switch (op) {
     case OP_CNC:
       assert(np == 1 || np == 2);
@@ -1684,8 +1686,6 @@ bool TYPVAL<PSZ>::Compute(PGLOBAL g, PVAL *vp, int np, OPVAL op)
   } // endswitch op
 
   Null = false;
-	} // endif p[i]
-
   return false;
   } // end of Compute