Add space between -m and 755 for install

Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
diff --git a/Makefile b/Makefile
index c45a1b1..ea74354 100644
--- a/Makefile
+++ b/Makefile
@@ -89,7 +89,7 @@
 	@cscope -b -R
 
 install: $(PROGS) $(SCRIPTS)
-	$(INSTALL) -m755 -d $(DESTDIR)$(bindir)
+	$(INSTALL) -m 755 -d $(DESTDIR)$(bindir)
 	$(INSTALL) $(PROGS) $(SCRIPTS) $(DESTDIR)$(bindir)
 	$(INSTALL) -m 755 -d $(DESTDIR)$(mandir)/man1
 	$(INSTALL) -m 644 fio.1 $(DESTDIR)$(mandir)/man1