staging: comedi: fix clean-up of comedi_class in comedi_init()
There is a clean-up bug in the core comedi module initialization functions, `comedi_init()`. If the `comedi_num_legacy_minors` module parameter is non-zero (and valid), it creates that many "legacy" devices and registers them in SysFS. A failure causes the function to clean up and return an error. Unfortunately, it fails to destroy the "comedi" class that was created earlier. Fix it by adding a call to `class_destroy(comedi_class)` at the appropriate place in the clean-up sequence. Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Cc: <stable@vger.kernel.org> # 3.9+ Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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