migration: Create migrate_tls_creds() 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

@@ -582,6 +582,13 @@ uint8_t migrate_throttle_trigger_threshold(void)
     return s->parameters.throttle_trigger_threshold;
 }
 
+const char *migrate_tls_creds(void)
+{
+    MigrationState *s = migrate_get_current();
+
+    return s->parameters.tls_creds;
+}
+
 uint64_t migrate_xbzrle_cache_size(void)
 {
     MigrationState *s = migrate_get_current();

migration/options.h

@@ -80,6 +80,7 @@ MultiFDCompression migrate_multifd_compression(void);
 int migrate_multifd_zlib_level(void);
 int migrate_multifd_zstd_level(void);
 uint8_t migrate_throttle_trigger_threshold(void);
+const char *migrate_tls_creds(void);
 uint64_t migrate_xbzrle_cache_size(void);
 
 /* parameters setters */

migration/tls.c

@@ -34,20 +34,19 @@ migration_tls_get_creds(MigrationState *s,
                         Error **errp)
 {
     Object *creds;
+    const char *tls_creds = migrate_tls_creds();
     QCryptoTLSCreds *ret;
 
-    creds = object_resolve_path_component(
-        object_get_objects_root(), s->parameters.tls_creds);
+    creds = object_resolve_path_component(object_get_objects_root(), tls_creds);
     if (!creds) {
-        error_setg(errp, "No TLS credentials with id '%s'",
-                   s->parameters.tls_creds);
+        error_setg(errp, "No TLS credentials with id '%s'", tls_creds);
         return NULL;
     }
     ret = (QCryptoTLSCreds *)object_dynamic_cast(
         creds, TYPE_QCRYPTO_TLS_CREDS);
     if (!ret) {
         error_setg(errp, "Object with id '%s' is not TLS credentials",
-                   s->parameters.tls_creds);
+                   tls_creds);
         return NULL;
     }
     if (!qcrypto_tls_creds_check_endpoint(ret, endpoint, errp)) {