[PATCH -next] virt: sevguest: Fix return value check in alloc_shared_pages()

[Yang Yingliang]

If alloc_pages() fails, it returns NULL pointer, replaces
IS_ERR() check with NULL pointer check.

Fixes: fce96cf04430 ("virt: Add SEV-SNP guest driver")
Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Signed-off-by: Yang Yingliang <yangyingliang@xxxxxxxxxx>
---
 drivers/virt/coco/sevguest/sevguest.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/virt/coco/sevguest/sevguest.c b/drivers/virt/coco/sevguest/sevguest.c
index 15afb6ce8d19..aaa6134d1d40 100644
--- a/drivers/virt/coco/sevguest/sevguest.c
+++ b/drivers/virt/coco/sevguest/sevguest.c
@@ -581,7 +581,7 @@ static void *alloc_shared_pages(size_t sz)
 	int ret;
 
 	page = alloc_pages(GFP_KERNEL_ACCOUNT, get_order(sz));
-	if (IS_ERR(page))
+	if (!page)
 		return NULL;
 
 	ret = set_memory_decrypted((unsigned long)page_address(page), npages);
-- 
2.25.1