Allow the -f argument to work.

PR:		bin/73229
Submitted by:	Irina Liakh <spell at itl dot ua>
MT4:		2 weeks
MT5:		After 5.3-RELEASE

usr.sbin/ancontrol/ancontrol.c

@@ -1547,7 +1547,7 @@ main(int argc, char *argv[])
 	opterr = 1;
 
 	while ((ch = getopt(argc, argv,
-	    "ANISCTRht:a:e:o:s:n:v:d:j:b:c:r:p:w:m:l:k:K:W:QZM:L:")) != -1) {
+	    "ANISCTRht:a:e:o:s:n:v:d:j:b:c:f:r:p:w:m:l:k:K:W:QZM:L:")) != -1) {
 		switch(ch) {
 		case 'Z':
 #ifdef ANCACHE