sh: Handle PCI controller resource conflicts.

register_pci_controller() can fail, but presently is a void function.
Change this over to an int so that we can bail early before continuing on
with post-registration initialization (such as throwing the controller in
to 66MHz mode in the case of the SH7780 host controller).

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/drivers/pci/pcie-sh7786.c b/arch/sh/drivers/pci/pcie-sh7786.c
index ac37ee8..feac1fe 100644
--- a/arch/sh/drivers/pci/pcie-sh7786.c
+++ b/arch/sh/drivers/pci/pcie-sh7786.c
@@ -296,9 +296,7 @@
 	if (unlikely(ret < 0))
 		return ret;
 
-	register_pci_controller(port->hose);
-
-	return 0;
+	return register_pci_controller(port->hose);
 }
 
 static struct sh7786_pcie_hwops sh7786_65nm_pcie_hwops __initdata = {