[patch] x86/PCI: MMCONFIG: shift wrapping in mcfg_ioremap()

[Dan Carpenter <dan.carpenter@oracle.com>]

This is a static checker fix.  "size" is a u64 here, but "num_buses" is
only 32 bits so we would hit shift wrapping bugs trying to use larger
sizes.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>

diff --git a/arch/x86/pci/mmconfig_64.c b/arch/x86/pci/mmconfig_64.c
index bea5249..430ed2b 100644
--- a/arch/x86/pci/mmconfig_64.c
+++ b/arch/x86/pci/mmconfig_64.c
@@ -98,8 +98,7 @@ const struct pci_raw_ops pci_mmcfg = {
 static void __iomem *mcfg_ioremap(struct pci_mmcfg_region *cfg)
 {
 	void __iomem *addr;
-	u64 start, size;
-	int num_buses;
+	u64 start, size, num_buses;
 
 	start = cfg->address + PCI_MMCFG_BUS_OFFSET(cfg->start_bus);
 	num_buses = cfg->end_bus - cfg->start_bus + 1;