fixed finsh_sysvar_append bug.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1996 bbd45198-f89e-11dd-88c7-29a3b14d5316

components/finsh/finsh_var.c

@@ -108,7 +108,7 @@ void finsh_sysvar_append(const char* name, u_char type, void* var_addr)
 		else
 		{
 			item->next = global_sysvar_list;
-			global_sysvar_list->next = item;
+			global_sysvar_list = item;
 		}
 	}
 }