ALSA: hda - fix use-after-free after module unload
register_vga_switcheroo() sets the PM ops from the hda structure which is freed later in azx_free. Make sure that these ops are cleared. Caught by KASAN, initially noticed due to a general protection fault. Fixes: 246efa4a ("snd/hda: add runtime suspend/resume on optimus support (v4)") Signed-off-by: NPeter Wu <peter@lekensteyn.nl> Cc: <stable@vger.kernel.org> Signed-off-by: NTakashi Iwai <tiwai@suse.de>
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