bind.c: Add missing size constant to err_msg

Signed-off-by: Norbert Pocs <npocs@redhat.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>
(cherry picked from commit e53a2711d3e4459c06b4d8facaca7195902f0405)

src/bind.c

@@ -282,7 +282,7 @@ int ssh_bind_listen(ssh_bind sshbind) {
       }
 
       if (listen(fd, 10) < 0) {
-        char err_msg[] = {0};
+        char err_msg[SSH_ERRNO_MSG_MAX] = {0};
           ssh_set_error(sshbind, SSH_FATAL,
                   "Listening to socket %d: %s",
                   fd, ssh_strerror(errno, err_msg, SSH_ERRNO_MSG_MAX));