private int compareSymbols(Symbol sym1, Symbol sym2) {
			if (sym1 == null) {
				return 1;
			}
			else if (sym2 == null) {
				return -1;
			}
			return sym1.getAddress().compareTo(sym2.getAddress());
		}
Called by the NamespaceManager when a namespace is removed; remove all symbols that have the
given namespace ID.

@param namespaceID ID of namespace being removed
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/symbol/SymbolManager.java