irqchip/gic-v3-its: Fix over allocation in itt_alloc_pool()

itt_alloc_pool() calls its_alloc_pages_node() to allocate an individual
page to add to the pool (for allocations <PAGE_SIZE). However the final
argument of its_alloc_pages_node() is the page order not the number of
pages. Currently it allocates two pages and leaks the second page.
Fix it by passing 0 instead (1 << 0 = 1 page).

Fixes: b08e2f4 ("irqchip/gic-v3-its: Share ITS tables with a non-trusted hypervisor")
Reported-by: Shanker Donthineni <[email protected]>
Signed-off-by: Steven Price <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Link: https://lore.kernel.org/all/[email protected]
Closes: https://lore.kernel.org/r/ed65312a-245c-4fa5-91ad-5d620cab7c6b%40nvidia.com

Author: Steven Price

drivers/irqchip/irq-gic-v3-its.c

@@ -261,7 +261,7 @@ static void *itt_alloc_pool(int node, int size)
 		if (addr)
 			break;
 
-		page = its_alloc_pages_node(node, GFP_KERNEL | __GFP_ZERO, 1);
+		page = its_alloc_pages_node(node, GFP_KERNEL | __GFP_ZERO, 0);
 		if (!page)
 			break;