migration: Create migrate_tls_hostname() function

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>

---

Moved the type to const char * (vladimir)

migration/options.c

@@ -596,6 +596,13 @@ const char *migrate_tls_creds(void)
     return s->parameters.tls_creds;
 }
 
+const char *migrate_tls_hostname(void)
+{
+    MigrationState *s = migrate_get_current();
+
+    return s->parameters.tls_hostname;
+}
+
 uint64_t migrate_xbzrle_cache_size(void)
 {
     MigrationState *s = migrate_get_current();

migration/options.h

@@ -82,6 +82,7 @@ int migrate_multifd_zstd_level(void);
 uint8_t migrate_throttle_trigger_threshold(void);
 const char *migrate_tls_authz(void);
 const char *migrate_tls_creds(void);
+const char *migrate_tls_hostname(void);
 uint64_t migrate_xbzrle_cache_size(void);
 
 /* parameters setters */

migration/tls.c

@@ -130,8 +130,9 @@ QIOChannelTLS *migration_tls_client_create(MigrationState *s,
         return NULL;
     }
 
-    if (s->parameters.tls_hostname && *s->parameters.tls_hostname) {
-        hostname = s->parameters.tls_hostname;
+    const char *tls_hostname = migrate_tls_hostname();
+    if (tls_hostname && *tls_hostname) {
+        hostname = tls_hostname;
     }
 
     return qio_channel_tls_new_client(ioc, creds, hostname, errp);