[patch] trivial warning fix for ndis_events

Hi,

Here is a trival patch to fix the format string to match the data
argument in ndis_events.

$ clang -O2 -pipe -c ndis_events.c
ndis_events.c:268:57: warning: more data arguments than '%' conversions
      [-Wformat-extra-args]
        fprintf(stderr, "Usage: ndis_events [-a] [-d] [-v]\n", progname);
                        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  ^

Index: usr.sbin/wpa/ndis_events/ndis_events.c
===================================================================
--- usr.sbin/wpa/ndis_events/ndis_events.c	(revision 193093)
+++ usr.sbin/wpa/ndis_events/ndis_events.c	(working copy)
_at__at_ -265,7 +265,7 _at__at_
 usage(progname)
 	char			*progname;
 {
-	fprintf(stderr, "Usage: ndis_events [-a] [-d] [-v]\n", progname);
+	fprintf(stderr, "Usage: %s [-a] [-d] [-v]\n", progname);
 	exit(1);
 }


-- 
Pawel