manifest: fix leak on error return from lazymanifest_filtercopy()...
manifest: fix leak on error return from lazymanifest_filtercopy()
Spotted by ASAN.
free(copy->lines) and Py_DECREF(copy->pydata) are replaced by Py_XDECREF(copy),
which should call lazymanifest_dealloc(). Freeing half-initialized copy->lines
is safe since copy->numlines holds a valid value.
