remove the bouncing email address of David Campbell

This patch removes a bouncing email address from the kernel sources.

Signed-off-by: Adrian Bunk <bunk@stusta.de>
diff --git a/drivers/scsi/ppa.h b/drivers/scsi/ppa.h
index f6e1a15..7511df3 100644
--- a/drivers/scsi/ppa.h
+++ b/drivers/scsi/ppa.h
@@ -2,7 +2,7 @@
  * the Iomega ZIP drive
  * 
  * (c) 1996     Grant R. Guenther  grant@torque.net
- *              David Campbell     campbell@torque.net
+ *              David Campbell
  *
  *      All comments to David.
  */