Improve structure of client-side CID extension parsing

Group configuring CID values together.
diff --git a/library/ssl_cli.c b/library/ssl_cli.c
index 1063f45..45f4c40 100644
--- a/library/ssl_cli.c
+++ b/library/ssl_cli.c
@@ -1340,14 +1340,13 @@
         return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
     }
 
+    ssl->handshake->cid_in_use = MBEDTLS_SSL_CID_ENABLED;
     ssl->handshake->peer_cid_len = (uint8_t) peer_cid_len;
     memcpy( ssl->handshake->peer_cid, buf, peer_cid_len );
 
     MBEDTLS_SSL_DEBUG_MSG( 3, ( "Use of CID extension negotiated" ) );
     MBEDTLS_SSL_DEBUG_BUF( 3, "Server CID", buf, peer_cid_len );
 
-    ssl->handshake->cid_in_use = MBEDTLS_SSL_CID_ENABLED;
-
     return( 0 );
 }
 #endif /* MBEDTLS_SSL_CID */