Trace more things. Add a CORS header for /mem so I can make an app to examine it. Fix a memory leak. Fix tf_realloc(NULL, 0).

git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@4187 ed5197a5-7fde-0310-b194-c3ffbd925b24

src/mem.c

@@ -218,6 +218,11 @@ static void* _tf_alloc(int64_t* total, size_t size)
 
 static void* _tf_realloc(int64_t* total, void* ptr, size_t size)
 {
+	if (!ptr && !size)
+	{
+		return NULL;
+	}
+
 	void* buffer[32];
 	int count = 0;
 	size_t overhead = sizeof(size_t);