ppp: Fix missing arg argument when using option flag OPT_A2STRVAL

The arg argument is missing to the printer call in the print_option
utility when the option flag OPT_A2STRVAL is set.

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@45264 3c298f89-4303-0410-b956-a3cf2f4a3e73

package/network/services/ppp/patches/550-fix-printer-args.patch

+--- a/pppd/options.c
++++ b/pppd/options.c
+@@ -1013,7 +1013,7 @@ print_option(opt, mainopt, printer, arg)
+ 			p = (char *) opt->addr2;
+ 			if ((opt->flags & OPT_STATIC) == 0)
+ 				p = *(char **)p;
+-			printer("%q", p);
++			printer(arg, "%q", p);
+ 		} else if (opt->flags & OPT_A2LIST) {
+ 			struct option_value *ovp;
+