lib: fix offset in tst_resm_hexd

Commit f72ca5b9c484 "lib: add tst_res_hexd for newlib"
broke tst_resm_hexd when I moved "offset = strlen(tmesg)"
before macro that expands varargs.

Fix it by moving offset initialisation after EXPAND_VAR_ARGS.

Signed-off-by: Jan Stancek <jstancek@redhat.com>
Acked-by: Cyril Hrubis <chrubis@suse.cz>
1 file changed