[t:3028] Minor, clear most_recent_env in toku_env_open() after verifying that...

[t:3028] Minor, clear most_recent_env in toku_env_open() after verifying that env is not already open.

git-svn-id: file:///svn/toku/tokudb@27535 c7de825b-a66e-492c-adef-691d508d4ae1

src/ydb.c

@@ -756,13 +756,13 @@ toku_env_open(DB_ENV * env, const char *home, u_int32_t flags, int mode) {
     BOOL newenv;  // true iff creating a new environment
     u_int32_t unused_flags=flags;
 
-    most_recent_env = NULL;
-
     if (env_opened(env)) {
 	r = toku_ydb_do_error(env, EINVAL, "The environment is already open\n");
         goto cleanup;
     }
 
+    most_recent_env = NULL;
+
     assert(sizeof(time_t) == sizeof(uint64_t));
 
     HANDLE_EXTRA_FLAGS(env, flags,