Free the 'page_list' when the 'npages' is zero.

Signed-off-by: Li Qiang <redacted>
---
  drivers/vhost/vdpa.c | 8 ++++++--
  1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index 3fab94f88894..6a9fcaf1831d 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c

@@ -609,8 +609,10 @@ static int vhost_vdpa_process_iotlb_update(struct vhost_vdpa *v,
  		gup_flags |= FOLL_WRITE;
  
  	npages = PAGE_ALIGN(msg->size + (iova & ~PAGE_MASK)) >> PAGE_SHIFT;
-	if (!npages)
-		return -EINVAL;
+	if (!npages) {
+		ret = -EINVAL;
+		goto free_page;
+	}
  
  	mmap_read_lock(dev->mm);
  

@@ -666,6 +668,8 @@ static int vhost_vdpa_process_iotlb_update(struct vhost_vdpa *v,
  		atomic64_sub(npages, &dev->mm->pinned_vm);
  	}
  	mmap_read_unlock(dev->mm);
+
+free_page:
  	free_page((unsigned long)page_list);
  	return ret;
  }