Fix A PostEventMsg call with a parameter NULL.

idEventArg don't have constructor with a pointer, a int should
avoid warning.

Signed-off-by: XoD <xoddark@gmail.com>

neo/d3xp/ai/AI_events.cpp

@@ -2489,7 +2489,7 @@ void idAI::Event_ThrowMoveable( void ) {
 	}
 	if ( moveable ) {
 		moveable->Unbind();
-		moveable->PostEventMS( &EV_SetOwner, 200, NULL );
+		moveable->PostEventMS( &EV_SetOwner, 200, 0 );
 	}
 }
 
@@ -2510,7 +2510,7 @@ void idAI::Event_ThrowAF( void ) {
 	}
 	if ( af ) {
 		af->Unbind();
-		af->PostEventMS( &EV_SetOwner, 200, NULL );
+		af->PostEventMS( &EV_SetOwner, 200, 0 );
 	}
 }