pki: Mark explicit fall through

Signed-off-by: Jakub Jelen <jjelen@redhat.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>

src/pki_ed25519_common.c

@@ -112,7 +112,7 @@ int pki_ed25519_key_cmp(const ssh_key k1,
         if (cmp != 0) {
             return 1;
         }
-        /* FALL THROUGH */
+        FALL_THROUGH;
     case SSH_KEY_CMP_PUBLIC:
         if (k1->ed25519_pubkey == NULL || k2->ed25519_pubkey == NULL) {
             return 1;