Correctly use APi as pointed out by remm.

Author: markt-asf

native/src/sslcontext.c

@@ -1032,8 +1032,9 @@ TCN_IMPLEMENT_CALL(jboolean, SSLContext, setCertificate)(TCN_STDARGS, jlong ctx,
     /* XXX Does this also work for pkcs12 or only for PEM files?
      * If only for PEM files move above to the PEM handling */
     if ((idx == 0) && (evp = SSL_dh_GetParamFromFile(cert_file))) {
-        SSL_CTX_set0_tmp_dh_pkey(c->ctx, evp);
-        EVP_PKEY_free(evp);
+        if (!SSL_CTX_set0_tmp_dh_pkey(c->ctx, evp)) {
+            EVP_PKEY_free(evp);
+        }
     }
 
 #ifdef HAVE_ECC