Fix the functionality again with hashed host names again.

The breakage came with commit 8b46528c0476af50a43b6e619f2db318a0cad194.

src/knownhost.c

@@ -509,7 +509,6 @@ static int hostline(LIBSSH2_KNOWNHOSTS *hosts,
             return rc;
     }
 
-    host = orig;
     memcpy(hostbuf, host, hostlen);
     hostbuf[hostlen]=0;