Unnecessary NULL check

bin/plugins/filter-a.c:

358        *instp = inst;
359
360cleanup:
   	
CID 281450 (#2 of 2): Dereference before null check (REVERSE_INULL)
check_after_deref: Null-checking inst suggests that it may be null, but it has already been dereferenced on all paths leading to the check.
361        if (result != ISC_R_SUCCESS && inst != NULL) {
362                plugin_destroy((void **)&inst);
363        }
364
365        return (result);

Also check bin/plugins/filter-aaaa.c for similar construct.