[cpp] Fix incorrect cast to VertexAttachment in SkeletonBinary

spine-cpp/spine-cpp/src/spine/SkeletonBinary.cpp

@@ -1249,13 +1249,13 @@ Animation *SkeletonBinary::readAnimation(const String &name, DataInput *input, S
 					setError("Attachment not found: ", attachmentName);
 					return NULL;
 				}
-				VertexAttachment *attachment = static_cast<VertexAttachment *>(baseAttachment);
 				unsigned int timelineType = readByte(input);
 				int frameCount = readVarint(input, true);
 				int frameLast = frameCount - 1;
 
 				switch (timelineType) {
 					case ATTACHMENT_DEFORM: {
+                        VertexAttachment *attachment = static_cast<VertexAttachment *>(baseAttachment);
 						bool weighted = attachment->_bones.size() > 0;
 						Vector<float> &vertices = attachment->_vertices;
 						int deformLength = weighted ? (int) vertices.size() / 3 * 2 : (int) vertices.size();
@@ -1311,7 +1311,7 @@ Animation *SkeletonBinary::readAnimation(const String &name, DataInput *input, S
 						break;
 					}
 					case ATTACHMENT_SEQUENCE: {
-						SequenceTimeline *timeline = new (__FILE__, __LINE__) SequenceTimeline(frameCount, slotIndex, attachment);
+						SequenceTimeline *timeline = new (__FILE__, __LINE__) SequenceTimeline(frameCount, slotIndex, baseAttachment);
 						for (int frame = 0; frame < frameCount; frame++) {
 							float time = readFloat(input);
 							int modeAndIndex = readInt(input);