vfio/type1: fix vaddr_get_pfns() return in vfio_pin_page_external()

vaddr_get_pfns() now returns the positive number of pfns successfully
gotten instead of zero. vfio_pin_page_external() might return 1 to
vfio_iommu_type1_pin_pages(), which will treat it as an error, if
vaddr_get_pfns() is successful but vfio_pin_page_external() doesn't
reach vfio_lock_acct().

Fix it up in vfio_pin_page_external(). Found by inspection.

Fixes: be16c1fd99f4 ("vfio/type1: Change success value of vaddr_get_pfn()")
Signed-off-by: Daniel Jordan <[e-mail]>
Message-Id: <[e-mail]>
Signed-off-by: Alex Williamson <[e-mail]>

drivers/vfio/vfio_iommu_type1.c

···
 		return -ENODEV;
 
 	ret = vaddr_get_pfns(mm, vaddr, 1, dma->prot, pfn_base, pages);
-	if (ret == 1 && do_accounting && !is_invalid_reserved_pfn(*pfn_base)) {
+	if (ret != 1)
+		goto out;
+
+	ret = 0;
+
+	if (do_accounting && !is_invalid_reserved_pfn(*pfn_base)) {
 		ret = vfio_lock_acct(dma, 1, true);
 		if (ret) {
 			put_pfn(*pfn_base, dma->prot);
···
 		}
 	}
 
+out:
 	mmput(mm);
 	return ret;
 }