finally fixed this memory bug

we were accidentally tracking frees of stuff that was never
allocated lol

src/cmem.c

@@ -10,6 +10,7 @@
 // realloc wrapper
 void *cosmoM_reallocate(CState *state, void *buf, size_t oldSize, size_t newSize)
 {
+    if (buf == NULL) oldSize = 0;
 #ifdef GC_DEBUG
     printf("old allocated bytes: %ld\n", state->allocatedBytes);
     if (buf) {