Move global io_base_addr into compilation units

Corresponding to flashrom svn r1813.

Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
diff --git a/nicintel_spi.c b/nicintel_spi.c
index 1522c9b..25bfa8f 100644
--- a/nicintel_spi.c
+++ b/nicintel_spi.c
@@ -179,7 +179,7 @@
 	if (!dev)
 		return 1;
 
-	io_base_addr = pcidev_readbar(dev, PCI_BASE_ADDRESS_0);
+	uint32_t io_base_addr = pcidev_readbar(dev, PCI_BASE_ADDRESS_0);
 	if (!io_base_addr)
 		return 1;