ssh: don't hang exiting sshd task

modules/SSH_Server/server.c

@@ -398,6 +398,7 @@ static void ssh_server(void *arg)
 #if defined(HAVE_ECC) && defined(FP_ECC) && defined(HAVE_THREAD_LS)
     wc_ecc_fp_free();  /* free per thread cache */
 #endif
+    vTaskDelete(NULL);
 }
 
 void ssh_server_init(void)