fix string compare error

diff --git a/tools/convert_imageset.cpp b/tools/convert_imageset.cpp
index a381eaf4c03e30e175116160c19af6684fb3ed4a..aa9515514c31322936f6255f22695ad73531a933 100644 (file)
--- a/tools/convert_imageset.cpp
+++ b/tools/convert_imageset.cpp
@@ -67,7 +67,7 @@ int main(int argc, char** argv) {
   string db_backend = "leveldb";
   if (argc >= (arg_offset+6)) {
     db_backend = string(argv[arg_offset+5]);
-    if (db_backend != "leveldb" || db_backend != "lmdb") {
+    if (!(db_backend == "leveldb") && !(db_backend == "lmdb")) {
       LOG(FATAL) << "Unknown db backend " << db_backend;
     }
   }