[ 034/101] staging: comedi: amplc_pc236: fix possible NULL deref during detach

3.6-stable review patch. If anyone has any objections, please let me know. -- From: Ian Abbott commit 2db012bd40b889d8e5483d3daa07af04c4c109d8 upstream. `pc236_detach()` is called by the comedi core to clean up if either `pc236_attach()` or `pc236_attach_pci()` returns an

[ 034/101] staging: comedi: amplc_pc236: fix possible NULL deref during detach

3.6-stable review patch. If anyone has any objections, please let me know. -- From: Ian Abbott abbo...@mev.co.uk commit 2db012bd40b889d8e5483d3daa07af04c4c109d8 upstream. `pc236_detach()` is called by the comedi core to clean up if either `pc236_attach()` or