4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Pan Bian <bianpan2...@163.com>


[ Upstream commit 758929005f06f954b7e1c87a1c9fdb44157b228f ]

Function devm_regmap_init_mmio() returns an ERR_PTR on error. However,
in function snvs_rtc_probe() its return value is checked against NULL.
This patch fixes it by checking the return value with IS_ERR().

Signed-off-by: Pan Bian <bianpan2...@163.com>
Signed-off-by: Alexandre Belloni <alexandre.bell...@free-electrons.com>
Signed-off-by: Sasha Levin <alexander.le...@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 drivers/rtc/rtc-snvs.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/rtc/rtc-snvs.c
+++ b/drivers/rtc/rtc-snvs.c
@@ -257,7 +257,7 @@ static int snvs_rtc_probe(struct platfor
                of_property_read_u32(pdev->dev.of_node, "offset", 
&data->offset);
        }
 
-       if (!data->regmap) {
+       if (IS_ERR(data->regmap)) {
                dev_err(&pdev->dev, "Can't find snvs syscon\n");
                return -ENODEV;
        }


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