[v3] misc: pci_endpoint_test: Fix return resource_size_t from pci_resource_len

[Hans Zhang]

With 8GB BAR2, running pcitest -b 2 fails with "TEST FAILED".

The return value of the `pci_resource_len` interface is not an integer.
Using `pcitest` with an 8GB BAR2, the bar_size of integer type will
overflow.
Change the data type of bar_size from integer to resource_size_t, to fix
the above issue.

Signed-off-by: Hans Zhang <18255117159@xxxxxxx>
Reviewed-by: Niklas Cassel <cassel@xxxxxxxxxx>

---
Changes since v2:
https://lore.kernel.org/linux-pci/20241220075253.16791-1-18255117159@xxxxxxx/

- Fix "changes" part goes below the --- line
- The patch commit message were modified.

Changes since v1:
https://lore.kernel.org/linux-pci/20241217121220.19676-1-18255117159@xxxxxxx/

- The patch subject and commit message were modified.
---
 drivers/misc/pci_endpoint_test.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/misc/pci_endpoint_test.c b/drivers/misc/pci_endpoint_test.c
index 3aaaf47fa4ee..414c4e55fb0a 100644
--- a/drivers/misc/pci_endpoint_test.c
+++ b/drivers/misc/pci_endpoint_test.c
@@ -280,10 +280,11 @@ static int pci_endpoint_test_bar_memcmp(struct pci_endpoint_test *test,
 static bool pci_endpoint_test_bar(struct pci_endpoint_test *test,
 				  enum pci_barno barno)
 {
-	int j, bar_size, buf_size, iters, remain;
 	void *write_buf __free(kfree) = NULL;
 	void *read_buf __free(kfree) = NULL;
 	struct pci_dev *pdev = test->pdev;
+	int j, buf_size, iters, remain;
+	resource_size_t bar_size;
 
 	if (!test->bar[barno])
 		return false;
-- 
2.25.1