wan: make read-only data const

Change several wan drivers to make strings and other initialize
only parameters const.

Compile tested only (with no new warnings)

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/wan/cycx_main.c b/drivers/net/wan/cycx_main.c
index a0e8611..859dba9 100644
--- a/drivers/net/wan/cycx_main.c
+++ b/drivers/net/wan/cycx_main.c
@@ -81,9 +81,9 @@
  */
 
 /* private data */
-static char cycx_drvname[] = "cyclomx";
-static char cycx_fullname[] = "CYCLOM 2X(tm) Sync Card Driver";
-static char cycx_copyright[] = "(c) 1998-2003 Arnaldo Carvalho de Melo "
+static const char cycx_drvname[] = "cyclomx";
+static const char cycx_fullname[] = "CYCLOM 2X(tm) Sync Card Driver";
+static const char cycx_copyright[] = "(c) 1998-2003 Arnaldo Carvalho de Melo "
 			  "<acme@conectiva.com.br>";
 static int cycx_ncards = CONFIG_CYCX_CARDS;
 static struct cycx_device *cycx_card_array;	/* adapter data space */