powerpc/ibmebus: Get rid of the IRQ mapping in ibmebus_free_irq()
ibmebus_free_irq() frees the IRQ but does not remove its mapping, which results in stale entries in the map. This fixes it by adding a call to irq_dispose_mapping() in ibmebus_free_irq(). Signed-off-by: NSebastien Dugue <sebastien.dugue@bull.net> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: NPaul Mackerras <paulus@samba.org>
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