Creates an integer hash code for the byte data in the [struct@GLib.
Bytes].
This function can be passed to [func@GLib.HashTable.new] as the key_hash_func parameter, when using non-`NULL` `GBytes`
pointers as keys in a [struct@GLib.HashTable].
| this |
a pointer to a [struct@GLib.Bytes] key |
|
a hash value corresponding to the key. |