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Call iounmap after free_irq to avoid invalid accesses in the
shared irq.  The patch is taken from
	https://bugzilla.novell.com/show_bug.cgi?id=167869

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>