Use early return in qa_user_favorite_set

Also improve comment

qa-include/qa-app-favorites.php

@@ -30,18 +30,27 @@
 	}
 
 
+	/**
+	 * Set an entity to be favorited or removed from favorites. Handles event reporting.
+	 *
+	 * @param int $userid ID of user assigned to the favorite
+	 * @param string $handle Username of user
+	 * @param string $cookieid Cookie ID of user
+	 * @param string $entitytype Entity type code (one of QA_ENTITY_* constants)
+	 * @param string $entityid ID of the entity being favorited (e.g. postid for questions)
+	 * @param bool $favorite Whether to add favorite (true) or remove favorite (false)
+	 */
 	function qa_user_favorite_set($userid, $handle, $cookieid, $entitytype, $entityid, $favorite)
-/*
-	If $favorite is true, set $entitytype and $entityid to be favorites of $userid with $handle and $cookieid, otherwise
-	remove them from its favorites list. Handles event reporting.
-*/
 	{
 		require_once QA_INCLUDE_DIR.'qa-db-favorites.php';
 		require_once QA_INCLUDE_DIR.'qa-app-limits.php';
 		require_once QA_INCLUDE_DIR.'qa-app-updates.php';
 
 		// Make sure the user is not favoriting themselves
-		if ($entitytype != QA_ENTITY_USER || $userid != $entityid) {
+		if ($entitytype == QA_ENTITY_USER && $userid == $entityid) {
+			return;
+		}
+
 		if ($favorite)
 			qa_db_favorite_create($userid, $entitytype, $entityid);
 		else
@@ -75,7 +84,6 @@
 
 		qa_report_event($action, $userid, $handle, $cookieid, $params);
 	}
-	}
 
 
 	function qa_favorite_q_list_view($questions, $usershtml)