hw/9pfs: use qemu_xxhash4

No need to pass zeros as we have helpers that do that for us.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-id: 20230526165401.574474-11-alex.bennee@linaro.org
Message-Id: <20230524133952.3971948-10-alex.bennee@linaro.org>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

hw/9pfs/9p.c

@@ -738,15 +738,14 @@ static VariLenAffix affixForIndex(uint64_t index)
     return invertAffix(&prefix); /* convert prefix to suffix */
 }
 
-/* creative abuse of tb_hash_func7, which is based on xxhash */
 static uint32_t qpp_hash(QppEntry e)
 {
-    return qemu_xxhash7(e.ino_prefix, e.dev, 0, 0, 0);
+    return qemu_xxhash4(e.ino_prefix, e.dev);
 }
 
 static uint32_t qpf_hash(QpfEntry e)
 {
-    return qemu_xxhash7(e.ino, e.dev, 0, 0, 0);
+    return qemu_xxhash4(e.ino, e.dev);
 }
 
 static bool qpd_cmp_func(const void *obj, const void *userp)