fix texture allocation success status tracking

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Decal/DecalSystem.cs

         // updates textures, texture atlas indices and blend value
         public void UpdateCachedMaterialData(CommandBuffer cmd)
         {
+            instance.m_AllocationSuccess = true;
             foreach (var pair in m_DecalSets)
             {
                 pair.Value.UpdateCachedMaterialData(cmd);