btrfs: tree-checker: remove duplicate definition of 'inode_item_err'

Remove the duplicate definition of 'inode_item_err' in the file
tree-checker.c that got there by accident in c23c77b0 ("btrfs:
tree-checker: Refactor inode key check into seperate function").
Reviewed-by: NNikolay Borisov <nborisov@suse.com>
Signed-off-by: NZheng Wei <wei.zheng@vivo.com>
Reviewed-by: NDavid Sterba <dsterba@suse.com>
Signed-off-by: NDavid Sterba <dsterba@suse.com>

fs/btrfs/tree-checker.c

@@ -957,10 +957,6 @@ static int check_dev_item(struct extent_buffer *leaf,
 	return 0;
 }
 
-/* Inode item error output has the same format as dir_item_err() */
-#define inode_item_err(eb, slot, fmt, ...)			\
-	dir_item_err(eb, slot, fmt, __VA_ARGS__)
-
 static int check_inode_item(struct extent_buffer *leaf,
 			    struct btrfs_key *key, int slot)
 {