-Werror,-Wunused-parameter

(--disable-assert-always-abort --enable-cipher-openssl-backend)

Change-Id: I0cf10fd6c788432a3312048cbde31ccc6f8fcbad
Reviewed-on: https://gerrit.libreoffice.org/59860
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

sal/rtl/cipher.cxx

@@ -715,6 +715,7 @@ static rtlCipherError BF_update(
     /* Update. */
 #if defined LIBO_CIPHER_OPENSSL_BACKEND
     assert(eMode == rtl_Cipher_ModeStream);
+    (void) eMode;
     (void) eDirection;
     while (nDatLen > std::numeric_limits<int>::max()) {
         int outl;