coverity#704243 Logically dead code

Change-Id: Ie1140a90a6c9723582fa5e18ca0cf1dc1f918742
Reviewed-on: https://gerrit.libreoffice.org/2942Reviewed-by: Thomas Arnhold <thomas@arnhold.org>
Reviewed-by: Thorsten Behrens <tbehrens@suse.com>
Tested-by: Thorsten Behrens <tbehrens@suse.com>

package/source/zipapi/blowfishcontext.cxx

@@ -72,7 +72,7 @@ uno::Sequence< sal_Int8 > SAL_CALL BlowfishCFB8CipherContext::convertWithCipherC
 
     if ( m_bEncrypt )
     {
-        rtl_cipher_encode( m_pCipher,
+        nError = rtl_cipher_encode( m_pCipher,
                           aData.getConstArray(),
                           aData.getLength(),
                           reinterpret_cast< sal_uInt8* >( aResult.getArray() ),
@@ -80,7 +80,7 @@ uno::Sequence< sal_Int8 > SAL_CALL BlowfishCFB8CipherContext::convertWithCipherC
     }
     else
     {
-        rtl_cipher_decode( m_pCipher,
+        nError = rtl_cipher_decode( m_pCipher,
                           aData.getConstArray(),
                           aData.getLength(),
                           reinterpret_cast< sal_uInt8* >( aResult.getArray() ),