Osprey crashes if it has no valid target

[SamVanheer]

If a monster_osprey is spawned with no valid target it will crash when it attempts to skip targets that are used for the grunt resupply path.

Change this:

halflife/dlls/osprey.cpp

Lines 397 to 404 in c7240b9

	if (m_pGoalEnt->pev->speed == 0)
	{
	SetThink( &COsprey::DeployThink );
	}
	do {
	m_pGoalEnt = CBaseEntity::Instance( FIND_ENTITY_BY_TARGETNAME ( NULL, STRING( m_pGoalEnt->pev->target ) ) );
	} while (m_pGoalEnt->pev->speed < 400 && !HasDead());
	UpdateGoal( );

To this:

if (m_pGoalEnt != nullptr)
{
	if (m_pGoalEnt->pev->speed == 0)
	{
		SetThink(&COsprey::DeployThink);
	}
	do
	{
		m_pGoalEnt = CBaseEntity::Instance(FIND_ENTITY_BY_TARGETNAME(NULL, STRING(m_pGoalEnt->pev->target)));
	} while (m_pGoalEnt->pev->speed < 400 && !HasDead());
	UpdateGoal();
	}

This change adds a null check to prevent the crash.

This also applies to the Black Ops Osprey in Opposing Force.