gslice: Do not try to memset-0 NULL a pointer
According to the docs, g_slice_free1() is supposed to do nothing if @mem_block is NULL, but we still try to zero it in case we're using g_mem_gc_friendly.
So avoid this case.
Closes: #2908 (closed)
According to the docs, g_slice_free1() is supposed to do nothing if @mem_block is NULL, but we still try to zero it in case we're using g_mem_gc_friendly.
So avoid this case.
Closes: #2908 (closed)