afs: Remove afs_operation::abort_code

Remove afs_operation::abort_code as it's read but never set.  Use
ac.abort_code instead.
Signed-off-by: David Howells <dhowells@redhat.com>

fs/afs/dir.c

@@ -648,7 +648,7 @@ static void afs_do_lookup_success(struct afs_operation *op)
 			vp = &op->file[0];
 			abort_code = vp->scb.status.abort_code;
 			if (abort_code != 0) {
-				op->abort_code = abort_code;
+				op->ac.abort_code = abort_code;
 				op->error = afs_abort_to_error(abort_code);
 			}
 			break;

fs/afs/internal.h

@@ -771,7 +771,6 @@ struct afs_operation {
 	struct timespec64	ctime;		/* Change time to set */
 	short			nr_files;	/* Number of entries in file[], more_files */
 	short			error;
-	unsigned int		abort_code;
 	unsigned int		debug_id;
 
 	unsigned int		cb_v_break;	/* Volume break counter before op */