libipt, ild; check ild pointer argument

Now that we indicate errors via the return value, we can report a NULL ild
argument.  The compiler should be able to remove redundant checks when inlining
decoders.

Change-Id: Id1e67042d64632475841d8cbdbe3c17dd29c57ed
Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>
1 file changed