knownhosts: Do not double free memory

CID 1393236

Signed-off-by: Andreas Schneider <asn@cryptomilk.org>

src/knownhosts.c

@@ -358,7 +358,6 @@ int ssh_known_hosts_parse_line(const char *hostname,
 
     p = strtok(known_host, " ");
     if (p == NULL ) {
-        free(known_host);
         rc = SSH_ERROR;
         goto out;
     }