KVM: arm64: vgic-v3: Release reserved slot outside of lpi_xa's lock

xa_release() expects to be called outside of the xa_lock. Fix
vgic_add_lpi() to drop the lock before calling and restructure to get
rid of the goto label.

Reported-by: Zenghui Yu <yuzenghui@huawei.com>
Closes: https://lore.kernel.org/kvmarm/d0853e82-7d95-5025-7abf-c6f1e0cdf7b5@huawei.com/
Fixes: 481c9ee ("KVM: arm64: vgic-its: Get rid of the lpi_list_lock")
Signed-off-by: Oliver Upton <oupton@kernel.org>
Link: https://patch.msgid.link/20251107184847.1784820-3-oupton@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>

Author: Oliver Upton

arch/arm64/kvm/vgic/vgic-its.c

@@ -115,21 +115,18 @@ static struct vgic_irq *vgic_add_lpi(struct kvm *kvm, u32 intid,
 		/* Someone was faster with adding this LPI, lets use that. */
 		kfree(irq);
 		irq = oldirq;
-
-		goto out_unlock;
+	} else {
+		ret = xa_err(__xa_store(&dist->lpi_xa, intid, irq, 0));
 	}
 
-	ret = xa_err(__xa_store(&dist->lpi_xa, intid, irq, 0));
+	xa_unlock_irqrestore(&dist->lpi_xa, flags);
+
 	if (ret) {
 		xa_release(&dist->lpi_xa, intid);
 		kfree(irq);
-	}
 
-out_unlock:
-	xa_unlock_irqrestore(&dist->lpi_xa, flags);
-
-	if (ret)
 		return ERR_PTR(ret);
+	}
 
 	/*
 	 * We "cache" the configuration table entries in our struct vgic_irq's.