[dxvk] Do not commit compute barriers for unbound resources

Fixes a crash in Neptunia VII.

src/dxvk/dxvk_context.cpp

@@ -1565,6 +1565,7 @@ namespace dxvk {
     auto layout = m_state.cp.pipeline->layout();
     
     for (uint32_t i = 0; i < layout->bindingCount(); i++) {
+      if (m_state.cp.bs.isBound(i)) {
         const DxvkDescriptorSlot binding = layout->binding(i);
         const DxvkShaderResourceSlot& slot = m_rc[binding.slot];
         
@@ -1597,6 +1598,7 @@ namespace dxvk {
             slot.imageView->imageInfo().access);
         }
       }
+    }
     
     m_barriers.recordCommands(m_cmd);
   }