davicom: Display proper debug level up to 6

This will make it explicit some messages are of the form:
dm9000_dbg(db, 5, ...
Signed-off-by: Mathieu Malaterre <malat@debian.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/davicom/dm9000.c

@@ -65,7 +65,7 @@ MODULE_PARM_DESC(watchdog, "transmit timeout in milliseconds");
  */
 static int debug;
 module_param(debug, int, 0644);
-MODULE_PARM_DESC(debug, "dm9000 debug level (0-4)");
+MODULE_PARM_DESC(debug, "dm9000 debug level (0-6)");
 
 /* DM9000 register address locking.
  *