misc: pci_endpoint_test: Remove redundant 'remainder' test

A BAR size is always a power of two. buf_size = min(SZ_1M, bar_size).
If the BAR size is <= 1MB, there will be one iteration, no remainder.
If the BAR size is > 1MB, there will be more than one iteration, but the
size will always be evenly divisible by 1MB, so no remainder.

Link: https://lore.kernel.org/r/20250109094556.1724663-2-18255117159@163.com
Suggested-by: Niklas Cassel <cassel@kernel.org>
Signed-off-by: Hans Zhang <18255117159@163.com>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Niklas Cassel <cassel@kernel.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>

Author: Hans Zhang

drivers/misc/pci_endpoint_test.c

@@ -283,7 +283,7 @@ 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;
+	int j, bar_size, buf_size, iters;
 	void *write_buf __free(kfree) = NULL;
 	void *read_buf __free(kfree) = NULL;
 	struct pci_dev *pdev = test->pdev;
@@ -316,12 +316,6 @@ static bool pci_endpoint_test_bar(struct pci_endpoint_test *test,
 						 write_buf, read_buf, buf_size))
 			return false;
 
-	remain = bar_size % buf_size;
-	if (remain)
-		if (pci_endpoint_test_bar_memcmp(test, barno, buf_size * iters,
-						 write_buf, read_buf, remain))
-			return false;
-
 	return true;
 }