libxtables: avoid running into .also checks when option not used
If a particular option was not specified, it should not be subject to
.also checks in xtables_option_fcheck2 either.
Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
diff --git a/xtoptions.c b/xtoptions.c
index 8d54dd8..9e19250 100644
--- a/xtoptions.c
+++ b/xtoptions.c
@@ -949,6 +949,9 @@
xt_params->exit_err(PARAMETER_PROBLEM,
"%s: option \"--%s\" must be specified\n",
name, entry->name);
+ if (!(xflags & (1 << entry->id)))
+ /* Not required, not specified, thus skip. */
+ continue;
for (i = 0; i < CHAR_BIT * sizeof(entry->id); ++i) {
if (entry->id == i)