staging: fpgaboot: fix coccinelle warnings

---
 drivers/staging/gs_fpgaboot/gs_fpgaboot.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)
 
diff --git a/drivers/staging/gs_fpgaboot/gs_fpgaboot.c b/drivers/staging/gs_fpgaboot/gs_fpgaboot.c
index fee2f61..31a6741 100644
--- a/drivers/staging/gs_fpgaboot/gs_fpgaboot.c
+++ b/drivers/staging/gs_fpgaboot/gs_fpgaboot.c
@@ -302,10 +302,7 @@ static int init_driver(void)
 {
 	firmware_pdev = platform_device_register_simple("fpgaboot", -1,
 							 NULL, 0);
-	if (IS_ERR(firmware_pdev))
-		return PTR_ERR(firmware_pdev);
-
-	return 0;
+	return PTR_ERR_OR_ZERO(firmware_pdev);
 }
 
 static void finish_driver(void)