pci: fix some warnings related to assumptions about

The following commit introduced some warnings associated with using
pci_addr_t instead of a proper 32-bit data type.

commit af778c6d9e2b945ee03cbc53bb976238a3374f33
Author: Andrew Sharp <andywyse6@gmail.com>
Date:   Wed Aug 1 12:27:16 2012 +0000

    pci: fix errant data types and corresponding access functions

On some platforms pci_addr_t is defined as a 64-bit data type so its not
proper to use with pci_{read,write}_config_dword.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/drivers/pci/pci_auto.c b/drivers/pci/pci_auto.c
index ae61e24..cd78030 100644
--- a/drivers/pci/pci_auto.c
+++ b/drivers/pci/pci_auto.c
@@ -89,7 +89,7 @@
 			  struct pci_region *prefetch,
 			  struct pci_region *io)
 {
-	pci_addr_t bar_response;
+	u32 bar_response;
 	pci_size_t bar_size;
 	u16 cmdstat = 0;
 	int bar, bar_nr = 0;