drivers/net: Add missing "space"

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/net/pppol2tp.c b/drivers/net/pppol2tp.c
index a7556cd..1b51bb6 100644
--- a/drivers/net/pppol2tp.c
+++ b/drivers/net/pppol2tp.c
@@ -2489,7 +2489,7 @@
 module_init(pppol2tp_init);
 module_exit(pppol2tp_exit);
 
-MODULE_AUTHOR("Martijn van Oosterhout <kleptog@svana.org>,"
+MODULE_AUTHOR("Martijn van Oosterhout <kleptog@svana.org>, "
 	      "James Chapman <jchapman@katalix.com>");
 MODULE_DESCRIPTION("PPP over L2TP over UDP");
 MODULE_LICENSE("GPL");