fix while condition

Author: SandrineP

src/subcommand/config_subcommand.cpp

@@ -43,7 +43,7 @@ void config_subcommand::run_list()
     throw_if_error(git_config_iterator_new(&iter, cfg));
 
     git_config_entry* entry;
-    while (git_config_next(&entry, iter))
+    while (git_config_next(&entry, iter) == GIT_OK)
     {
         std::cout << entry->name << "=" << entry->value << std::endl;
     }