refactor: Drop owns_lock() call

Co-authored-by: Vasil Dimov <vd@FreeBSD.org>

src/sync.h

@@ -165,10 +165,11 @@ private:
     bool TryEnter(const char* pszName, const char* pszFile, int nLine)
     {
         EnterCritical(pszName, pszFile, nLine, Base::mutex(), true);
-        if (!Base::try_lock()) {
-            LeaveCritical();
+        if (Base::try_lock()) {
+            return true;
         }
-        return Base::owns_lock();
+        LeaveCritical();
+        return false;
     }
 
 public: