irqchip/gic-v3-its: Remove BUG_ON in its_vpe_irq_domain_alloc

[ Upstream commit 382d2ffe86efb1e2fa803d2cf17e5bfc34e574f3 ]

This BUG_ON() is useless, because the same effect will be obtained
by letting the code run its course and vm being dereferenced,
triggering an exception.

So just remove this check.

Signed-off-by: Guanrui Huang <guanrui.huang@linux.alibaba.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Zenghui Yu <yuzenghui@huawei.com>
Acked-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20240418061053.96803-3-guanrui.huang@linux.alibaba.com


Signed-off-by: Sasha Levin <sashal@kernel.org>
(cherry picked from commit 139510ec274c7cc8739bb8f63aed70e425c2f0d8)
[Vegard: fix conflict in context due to missing commit
 38dd7c494cf604879e187e9b56690d25f876cf69 ("irqchip/gic-v3-its: Drop
 chunk allocation compatibility").]
Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>