Use wl_fixed_t for axis bindings

In preparation for axis values being wl_fixed_t in the protocol as well.

Signed-off-by: Daniel Stone <daniel@fooishbar.org>
diff --git a/src/util.c b/src/util.c
index bde4987..3d28f8f 100644
--- a/src/util.c
+++ b/src/util.c
@@ -405,7 +405,7 @@
 weston_compositor_run_axis_binding(struct weston_compositor *compositor,
 				   struct weston_seat *seat,
 				   uint32_t time, uint32_t axis,
-				   int32_t value)
+				   wl_fixed_t value)
 {
 	struct weston_binding *b;