archive: remove ::compression_{code,name}

These internal variables were set but never used. Remove them.

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>

libarchive/archive_private.h

@@ -112,9 +112,6 @@ struct archive {
 	int		  archive_format;
 	const char	 *archive_format_name;
 
-	int	  compression_code;	/* Currently active compression. */
-	const char *compression_name;
-
 	/* Number of file entries processed. */
 	int		  file_count;
 

libarchive/archive_read.c

@@ -578,8 +578,6 @@ choose_filters(struct archive_read *a)
 				__archive_read_free_filters(a);
 				return (ARCHIVE_FATAL);
 			}
-			a->archive.compression_name = a->filter->name;
-			a->archive.compression_code = a->filter->code;
 			return (ARCHIVE_OK);
 		}