Crash in oa_push() function

Hi, Mikko!

I found crash in oa_push() here:
#ifdef gxrealloc
//If compiler supports realloc.
arr->data = (gxObject**)gxrealloc(arr->data, arr->capacity * sizeof(gxObject*));
#else
.....

In my case gxrealloc() returns NULL and at the end of function:
arr->data[arr->size] = item;
crashes program.

I think if gxrealloc() returns NULL need return DLMS_ERROR_CODE_OUTOFMEMORY;

BR,
Dmitry