staging: mfd: hi6421-spmi-pmic: fix some coding style issues

Checkpatch complains about some minor issues inside this
driver that were not addressed by the previous patch.

Address them.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/84b53d20632c84cc60b8dadfe937f3c54b355cef.1597647359.git.mchehab+huawei@kernel.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/hikey9xx/hi6421-spmi-pmic.c

@@ -350,7 +350,7 @@ static int hi6421_spmi_pmic_probe(struct spmi_device *pdev)
 	 * The logic below will rely that the pmic is already stored at
 	 * drvdata.
 	 */
-	dev_dbg(&pdev->dev, "SPMI-PMIC: adding childs for %pOF\n",
+	dev_dbg(&pdev->dev, "SPMI-PMIC: adding children for %pOF\n",
 		pdev->dev.of_node);
 	ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE,
 				   hi6421v600_devs, ARRAY_SIZE(hi6421v600_devs),