[bcachefs:bcachefs-testing 127/129] fs/bcachefs/btree_iter.h:38:18: warning: unused variable 'idx'

[bcachefs:bcachefs-testing 127/129] fs/bcachefs/btree_iter.h:38:18: warning: unused variable 'idx'

[kernel test robot]

tree:   https://evilpiepirate.org/git/bcachefs.git bcachefs-testing
head:   9d089bb2428fdbcfc5a2f00e7968d2b697c8bb20
commit: bc47374601095a64f77eb477f04b83bebef79b22 [127/129] bcachefs: Add check for btree_path ref overflow
config: m68k-defconfig (https://download.01.org/0day-ci/archive/20240717/202407172020.86bCXnde-lkp@intel.com/config)
compiler: m68k-linux-gcc (GCC) 14.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240717/202407172020.86bCXnde-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202407172020.86bCXnde-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from fs/bcachefs/str_hash.h:5,
                    from fs/bcachefs/xattr.h:5,
                    from fs/bcachefs/acl.c:6:
   fs/bcachefs/btree_iter.h: In function '__btree_path_put':
>> fs/bcachefs/btree_iter.h:38:18: warning: unused variable 'idx' [-Wunused-variable]
      38 |         unsigned idx = path - trans->paths;
         |                  ^~~


vim +/idx +38 fs/bcachefs/btree_iter.h

    35	
    36	static inline bool __btree_path_put(struct btree_trans *trans, struct btree_path *path, bool intent)
    37	{
  > 38		unsigned idx = path - trans->paths;
    39	
    40		EBUG_ON(!test_bit(idx, trans->paths_allocated));
    41		EBUG_ON(!path->ref);
    42		EBUG_ON(!path->intent_ref && intent);
    43	
    44		path->intent_ref -= intent;
    45		return --path->ref == 0;
    46	}
    47	

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