more trivial signedness fixes in drivers

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/atm/firestream.c b/drivers/atm/firestream.c
index 737cea4..94ebc9d 100644
--- a/drivers/atm/firestream.c
+++ b/drivers/atm/firestream.c
@@ -1295,7 +1295,7 @@
 
 static void __devinit undocumented_pci_fix (struct pci_dev *pdev)
 {
-	int tint;
+	u32 tint;
 
 	/* The Windows driver says: */
 	/* Switch off FireStream Retry Limit Threshold