Merge pull request cstack#18 from sairoutine/fix_uninitialized_root_page_num

fix uninitialized root_page_num

Author: cstack

db.c

@@ -498,6 +498,7 @@ Table* db_open(const char* filename) {
 
   Table* table = malloc(sizeof(Table));
   table->pager = pager;
+  table->root_page_num = 0;
 
   if (pager->num_pages == 0) {
     // New database file. Initialize page 0 as leaf node.