afs: Invalid op ID should abort with RXGEN_OPCODE

When we are given an invalid operation ID, we should abort that with
RXGEN_OPCODE rather than RX_INVALID_OPERATION.

Also map RXGEN_OPCODE to -ENOTSUPP.

Signed-off-by: David Howells <dhowells@redhat.com>

fs/afs/misc.c

@@ -84,6 +84,8 @@ int afs_abort_to_error(u32 abort_code)
 	case RXKADDATALEN:	return -EKEYREJECTED;
 	case RXKADILLEGALLEVEL:	return -EKEYREJECTED;
 
+	case RXGEN_OPCODE:	return -ENOTSUPP;
+
 	default:		return -EREMOTEIO;
 	}
 }