Fix memory leak when using PSK session files

We were not freeing the session created when loading a PSK session file.

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Bernd Edlinger <bernd.edlinger@hotmail.de>
(Merged from https://github.com/openssl/openssl/pull/3855)

apps/s_client.c

diff --git a/apps/s_client.c b/apps/s_client.c
index 56209ac..5525b31 100644
--- a/apps/s_client.c
+++ b/apps/s_client.c
@@ -3009,6 +3009,7 @@
             print_stuff(bio_c_out, con, 1);
         SSL_free(con);
     }
+    SSL_SESSION_free(psksess);
 #if !defined(OPENSSL_NO_NEXTPROTONEG)
     OPENSSL_free(next_proto.data);
 #endif

apps/s_server.c

diff --git a/apps/s_server.c b/apps/s_server.c
index 13cc7a1..8df767c 100644
--- a/apps/s_server.c
+++ b/apps/s_server.c
@@ -2104,6 +2104,7 @@
     ret = 0;
  end:
     SSL_CTX_free(ctx);
+    SSL_SESSION_free(psksess);
     set_keylog_file(NULL, NULL);
     X509_free(s_cert);
     sk_X509_CRL_pop_free(crls, X509_CRL_free);