core: Add files to blob list on scan

Signed-off-by: Chloe M. <chloe@mirocom.org>

core/stream_file.c

@@ -66,6 +66,11 @@ stream_destroy(struct data_stream *stmp)
         return;
     }
 
+    if (stmp->data == NULL) {
+        return;
+    }
+
     free(stmp->data);
     stmp->length = 0;
+    stmp->data = NULL;
 }