[PATCH master] watchdog: dw_wdt: fix resource reservation error check

[Ahmad Fatoum]

dev_request_mem_resource returns a possible error pointer. If it
succeeds mem->start will always be valid. Rectify the confusion.

Signed-off-by: Ahmad Fatoum <a.fatoum at pengutronix.de>
---
 drivers/watchdog/dw_wdt.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/watchdog/dw_wdt.c b/drivers/watchdog/dw_wdt.c
index 70d6f0cced72..774d211a5f90 100644
--- a/drivers/watchdog/dw_wdt.c
+++ b/drivers/watchdog/dw_wdt.c
@@ -143,9 +143,10 @@ static int dw_wdt_drv_probe(struct device_d *dev)
 	dw_wdt = xzalloc(sizeof(*dw_wdt));
 
 	mem = dev_request_mem_resource(dev, 0);
+	if (IS_ERR(mem))
+		return PTR_ERR(mem);
+
 	dw_wdt->regs = IOMEM(mem->start);
-	if (IS_ERR(dw_wdt->regs))
-		return PTR_ERR(dw_wdt->regs);
 
 	clk = clk_get(dev, NULL);
 	if (IS_ERR(clk))
-- 
2.29.2