garray: initialize allocated size in g_byte_array_new_take()
Internal allocation size (array->alloc) was being kept to 0 when a new
GByteArray was created from an already existing heap-allocated buffer.
Among other things, this was making g_byte_array_set_size() fully clear all
the buffer contents (not just the newly allocated memory) when
G_DEBUG=gc-friendly was being used...
if (G_UNLIKELY (g_mem_gc_friendly))
memset (array->data + array->alloc, 0, want_alloc - array->alloc);
https://bugzilla.gnome.org/show_bug.cgi?id=738170