signature: fix memory leak in DetectBytejumpSetup

src/detect-bytejump.c

@@ -586,6 +586,7 @@ static int DetectBytejumpSetup(DetectEngineCtx *de_ctx, Signature *s, const char
         data->offset = ((DetectByteExtractData *)bed_sm->ctx)->local_id;
         data->flags |= DETECT_BYTEJUMP_OFFSET_BE;
         SCFree(offset);
+        offset = NULL;
     }
 
     sm = SigMatchAlloc();
@@ -613,6 +614,9 @@ static int DetectBytejumpSetup(DetectEngineCtx *de_ctx, Signature *s, const char
     ret = 0;
     return ret;
  error:
+    if (offset != NULL) {
+        SCFree(offset);
+    }
     DetectBytejumpFree(data);
     return ret;
 }