Fix symbolic link to tc-bfifo.8

tc-pbfifo.8 does not exist because it was moved to tc-bfifo.8.
Signed-off-by: Yasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp>
Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>

Makefile

@@ -52,8 +52,7 @@ install: all
 	install -m 0644 $(shell find etc/iproute2 -maxdepth 1 -type f) $(DESTDIR)$(CONFDIR)
 	install -m 0755 -d $(DESTDIR)$(MANDIR)/man8
 	install -m 0644 $(shell find man/man8 -maxdepth 1 -type f) $(DESTDIR)$(MANDIR)/man8
-	ln -sf tc-pbfifo.8  $(DESTDIR)$(MANDIR)/man8/tc-bfifo.8
-	ln -sf tc-pbfifo.8  $(DESTDIR)$(MANDIR)/man8/tc-pfifo.8
+	ln -sf tc-bfifo.8  $(DESTDIR)$(MANDIR)/man8/tc-pfifo.8
 	install -m 0755 -d $(DESTDIR)$(MANDIR)/man3
 	install -m 0644 $(shell find man/man3 -maxdepth 1 -type f) $(DESTDIR)$(MANDIR)/man3