longName() method in PointerType class may cause stack overflow

[ywei]

In edu.udel.cis.vsl.tass.model.impl.type.PointerType.java, in method longName() (starting from line 61). If the base type of a pointer type is a struct type, this method will try to call the long name method in the struct type. So it may cause an infinite recursion if a struct contains a pointer to itself such as the following example:

struct Foo {

int a;
struct Foo *next;

}

If we change the method to only print out the name of the struct instead of the inner structure of the method, the infinite recursion can be avoided.

[ywei]

I think this bug has been fixed. So we can close it.