x86/pci/intel_mid_pci: Propagate actual return code
mp_map_gsi_to_irq() returns different codes if it fails. intel_mid_pci_irq_enable() hides this under -EBUSY. Return the actual failure code. Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: Bjorn Helgaas <bhelgaas@google.com> Link: http://lkml.kernel.org/r/1438161409-4671-3-git-send-email-andriy.shevchenko@linux.intel.comSigned-off-by: NThomas Gleixner <tglx@linutronix.de>
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