isdataat: fix mem leak

src/detect-isdataat.c

@@ -247,6 +247,7 @@ int DetectIsdataatSetup (DetectEngineCtx *de_ctx, Signature *s, const char *isda
         idad->dataat == 1 &&
         (idad->flags & (ISDATAAT_RELATIVE|ISDATAAT_NEGATED)) == (ISDATAAT_RELATIVE|ISDATAAT_NEGATED))
     {
+        DetectIsdataatFree(idad);
         DetectContentData *cd = (DetectContentData *)prev_pm->ctx;
         cd->flags |= DETECT_CONTENT_ENDS_WITH;
         ret = 0;