QSet: remove misleading bool comparison with 0

Q6Hash::remove() returns a bool, not an integer, like Q5Hash::remove() did.

Pick-to: 6.9 6.8 6.5
Change-Id: Ia2907c7a2a4177f9b5ad05ca1ef3b9a5baa8137a
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>

src/corelib/tools/qset.h

@@ -64,7 +64,7 @@ public:
 
     inline void clear() { q_hash.clear(); }
 
-    inline bool remove(const T &value) { return q_hash.remove(value) != 0; }
+    bool remove(const T &value) { return q_hash.remove(value); }
 
     template <typename Pred>
     inline qsizetype removeIf(Pred predicate)