Release pkey_ctx on initialization failure

CLA: trivial

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from #24366)

(cherry picked from commit 3e9d933)

ssl/statem/statem_srvr.c

@@ -3134,7 +3134,7 @@ static int tls_process_cke_gost(SSL *s, PACKET *pkt)
     }
     if (EVP_PKEY_decrypt_init(pkey_ctx) <= 0) {
         SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
-        return 0;
+        goto err;
     }
     /*
      * If client certificate is present and is of the same type, maybe