permission: address coverity warning

The latest version of coverity has suggestions on how to improve formance. Address one of these suggestions. Signed-off-by: Michael Dawson <[email protected]> PR-URL: #50215 Reviewed-By: Rafael Gonzaga <[email protected]> Reviewed-By: Benjamin Gruenbaum <[email protected]> Reviewed-By: Marco Ippolito <[email protected]>

Author: mhdawson

src/permission/fs_permission.h

@@ -31,7 +31,7 @@ class FSPermission final : public PermissionBase{
 
 Node() : wildcard_child(nullptr), is_leaf(false){}
 
- Node* CreateChild(std::string prefix){
+ Node* CreateChild(conststd::string& prefix){
 if (prefix.empty() && !is_leaf){
  is_leaf = true;
 returnthis;