Add self-assignment check in operator=
Add self-assignment check in operator=

Method 'operator=' should check its argument with 'this' pointer.
black78/taglib,taglib/taglib,Distrotech/taglib,black78/taglib,taglib/taglib,Distrotech/taglib,Distrotech/taglib,TsudaKageyu/taglib,TsudaKageyu/taglib,black78/taglib,taglib/taglib,TsudaKageyu/taglib