zoom: Change zoom->active to a bool

Signed-off-by: Derek Foreman <derekf@osg.samsung.com>
Reviewed-by: Bryce Harrington <bryce@osg.samsung.com>
diff --git a/src/compositor.h b/src/compositor.h
index d0c6034..b69547f 100644
--- a/src/compositor.h
+++ b/src/compositor.h
@@ -147,7 +147,7 @@
 };
 
 struct weston_output_zoom {
-	int active;
+	bool active;
 	float increment;
 	float level;
 	float max_level;