Closes #792

Verification of non-null is done before trying a toku-free

git-svn-id: file:///svn/tokudb@3851 c7de825b-a66e-492c-adef-691d508d4ae1

newbrt/ybt.c

@@ -42,7 +42,7 @@ static inline void dbt_set_copy(DBT* ybt, bytevec data, ITEMLEN len, void** stat
     if (ybt) {
         if (ybt->flags==DB_DBT_REALLOC && ybt->data) toku_free(ybt->data);
         else if (ybt->flags==0) {
-            toku_free(*staticptrp);
+            if (*staticptrp) toku_free(*staticptrp);
             *staticptrp = tmp_data;
         }
         if (ybt->flags!=DB_DBT_USERMEM) {