Add additional error handling to pcidev_readbar() callers

This is mostly a leftover of Niklas' "remove exit call from pcidev_init" patch.
While not explicitly necessary detecting errors early is usually a good idea.

Corresponding to flashrom svn r1718.

Signed-off-by: Niklas Söderlund <>
Signed-off-by: Stefan Tauner <>
Acked-by: Stefan Tauner <>
diff --git a/drkaiser.c b/drkaiser.c
index 8c9fb6a..0cf1fdb 100644
--- a/drkaiser.c
+++ b/drkaiser.c
@@ -69,6 +69,8 @@
 		return 1;
 	addr = pcidev_readbar(dev, PCI_BASE_ADDRESS_2);
+	if (!addr)
+		return 1;
 	/* Write magic register to enable flash write. */