Prevent crash on dismount, thanks Salaman for the report!

CraftBukkit-Patches/0058-Entity-Mount-and-Dismount-Events.patch

@@ -1,18 +1,18 @@
-From e87d5c46dc469f08b5fd0db8a06301fa83f9f78e Mon Sep 17 00:00:00 2001
+From 27928f3910adc76ee6a1b59a7c4d0d9f521260d0 Mon Sep 17 00:00:00 2001
 From: md_5 <md_5@live.com.au>
 Date: Tue, 2 Jul 2013 20:32:49 +1000
 Subject: [PATCH] Entity Mount and Dismount Events
 
 
 diff --git a/src/main/java/net/minecraft/server/Entity.java b/src/main/java/net/minecraft/server/Entity.java
-index 8fbf811..83f6730 100644
+index 8fbf811..fe0b43a 100644
 --- a/src/main/java/net/minecraft/server/Entity.java
 +++ b/src/main/java/net/minecraft/server/Entity.java
 @@ -1409,6 +1409,7 @@ public abstract class Entity {
                  if ((this.bukkitEntity instanceof LivingEntity) && (this.vehicle.getBukkitEntity() instanceof Vehicle)) {
                      VehicleExitEvent event = new VehicleExitEvent((Vehicle) this.vehicle.getBukkitEntity(), (LivingEntity) this.bukkitEntity);
                      pluginManager.callEvent(event);
-+                    pluginManager.callEvent( new org.spigotmc.event.entity.EntityDismountEvent( this.getBukkitEntity(), entity.getBukkitEntity() ) ); // Spigot
++                    pluginManager.callEvent( new org.spigotmc.event.entity.EntityDismountEvent( this.getBukkitEntity(), this.vehicle.getBukkitEntity() ) ); // Spigot
                  }
                  // CraftBukkit end