Prevent accidental conversion from int to Status.

Test: compilation
Change-Id: I28c2eaa25b90d835b47dc7596abc5b613f18bf30
diff --git a/libnetdutils/include/netdutils/Status.h b/libnetdutils/include/netdutils/Status.h
index f0ce58a..302da96 100644
--- a/libnetdutils/include/netdutils/Status.h
+++ b/libnetdutils/include/netdutils/Status.h
@@ -31,7 +31,7 @@
   public:
     Status() = default;
 
-    Status(int code) : mCode(code) {}
+    explicit Status(int code) : mCode(code) {}
 
     Status(int code, const std::string& msg) : mCode(code), mMsg(msg) { assert(!ok()); }