PCI: Improve __pci_read_base() robustness

Local variables 'l' and 'sz' are uninitialized.  Normally, they would
be initialized by pci_read_config_dword() but when an error occurs,
some drivers immediately return an error code, which leaves the
argument uninitialized.

Provide a safe initial value to make the code more robust.

Signed-off-by: Marc Gonzalez <marc_gonzalez@sigmadesigns.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

drivers/pci/probe.c

@@ -175,7 +175,7 @@ static inline unsigned long decode_bar(struct pci_dev *dev, u32 bar)
 int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
 		    struct resource *res, unsigned int pos)
 {
-	u32 l, sz, mask;
+	u32 l = 0, sz = 0, mask;
 	u64 l64, sz64, mask64;
 	u16 orig_cmd;
 	struct pci_bus_region region, inverted_region;