Fix hasTangentsAndBitangents method in AiMesh.java (#6345)

original code m_tangents != null && m_tangents != null; triggers error prone

Co-authored-by: Kim Kulling <[email protected]>

port/jassimp/jassimp/src/jassimp/AiMesh.java

@@ -314,7 +314,7 @@ public final class AiMesh {
      * @return true if tangents and bitangents are available
      */
     public boolean hasTangentsAndBitangents() {
-        return m_tangents != null && m_tangents != null;
+        return m_tangents != null && m_bitangents != null;
     }