public VariableStorage getVariableStorage() throws InvalidInputException {
		Varnode[] varnodes = getVarnodesAsArray();
		return varnodes.length != 0
				? new VariableStorage(program.getGhidraProgram(), varnodes)
				: VariableStorage.UNASSIGNED_STORAGE;
	}
If this is a static/global variable, stored at a ram address, return it's
ram address.

@return address of where this variable is stored, null if not ram address
Ghidra/Features/Base/src/main/java/ghidra/app/util/bin/format/dwarf/DWARFVariable.java