Merge pull request #15766 from mogemimi/fix-unused-param

Fix unused parameter warning

cocos/2d/CCActionCatmullRom.cpp

@@ -57,6 +57,9 @@ PointArray* PointArray::create(ssize_t capacity)
 bool PointArray::initWithCapacity(ssize_t capacity)
 {
     _controlPoints = new (std::nothrow) vector<Vec2*>();
+    if (capacity > 0) {
+        _controlPoints->reserve(capacity);
+    }
     
     return true;
 }