Free appname if it was set after initializing crypto.

Fixes openssl#24729

CLA: trivial

Reviewed-by: Neil Horman <nhorman@openssl.org>
Reviewed-by: Paul Dale <ppzgs1@gmail.com>
Reviewed-by: Bernd Edlinger <bernd.edlinger@hotmail.de>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from openssl#24730)

(cherry picked from commit fbd6609)

crypto/conf/conf_sap.c

@@ -37,6 +37,8 @@ void OPENSSL_config(const char *appname)
         settings.appname = strdup(appname);
     settings.flags = DEFAULT_CONF_MFLAGS;
     OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CONFIG, &settings);
+
+    free(settings.appname);
 }
 #endif