[ACPI] iosapic_register_intr() now returns error instead of panic
error condition is passed along by acpi_register_gsi(). Signed-off-by: NKenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> Signed-off-by: NAndrew Morton <akpm@osdl.org> Signed-off-by: NLen Brown <len.brown@intel.com>
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