Return NULL instead of "" from sel_getTypes_np() - matches behaviour of sel_get_types() and makes more sense.

dtable.c

@@ -8,18 +8,25 @@
 
 SparseArray *__objc_uninstalled_dtable;
 
+/**
+ * Structure for maintaining a linked list of temporary dtables.  When sending
+ * an +initialize message to a class, we create a temporary dtables and store
+ * it in a linked list.  This is then used when sending other messages to
+ * instances of classes in the middle of initialisation.
+ */
 typedef struct _InitializingDtable
 {
+	/** The class that owns the dtable. */
 	Class class;
+	/** The dtable for this class. */
 	void *dtable;
+	/** The next uninstalled dtable in the list. */
 	struct _InitializingDtable *next;
 } InitializingDtable;
 
-/** Protected by initialize_lock */
+/** Head of the list of temporary dtables.  Protected by initialize_lock. */
 InitializingDtable *temporary_dtables;
 
-static SparseArray *create_dtable_for_class (Class class);
-
 static uint32_t dtable_depth = 8;
 
 void __objc_init_dispatch_tables ()

selector_table.c

@@ -273,7 +273,7 @@ SEL sel_registerTypedName_np(const char *selName, const char *types)
 
 const char *sel_getType_np(SEL aSel)
 {
-	return (NULL == aSel->types) ? "" : aSel->types;
+	return aSel->types;
 }