private String testNameValidity(String name) {
		if (name == null || name.length() == 0) {
			return "Must provide a name for the data-type";
		}
		return null;
	}
Make sure the given String works as a data-type name
@param name is the given String
@return an error message or null if the name is valid
Ghidra/Features/Decompiler/src/main/java/ghidra/app/plugin/core/decompile/actions/CreatePointerRelative.java