mfd: qcom_rpm: Fix a possible NULL dereference

of_match_device could return NULL, and so cause a NULL pointer
dereference later.

Signed-off-by: LABBE Corentin <[e-mail]>
Signed-off-by: Lee Jones <[e-mail]>

drivers/mfd/qcom_rpm.c

···
 	}
 
 	match = of_match_device(qcom_rpm_of_match, &pdev->dev);
+	if (!match)
+		return -ENODEV;
 	rpm->data = match->data;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);