title: pci_lookup_name how to?
body: <p>I'm new to <code>libpci</code>.
  I wrote a C program, that can dectect the GPU and give its <code>vendor_id</code> and <code>device_id</code>. Now I don't know if I can get the <code>vendor_name</code> from its ID using <code>libpci</code>.</p>
  
  <pre><code>vendor = pci_lookup_name(pci_access, buffer, sizeof(buffer), PCI_LOOKUP_VENDOR, radeon-&gt;vendor);
  </code></pre>
  
  <p>I worte this code but it doesn't seem to work. Help me out, with some documentation, thanks a lot. :)</p>