mfd: intel_soc_pmic_bxtwc: Use sysfs_emit() instead of sprintf()

sysfs_emit() is preferred over sprintf() when formatting the value to be
returned to user space in show() functions, because it knows about sysfs
buffer specifics and has sanity checks.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20220628221747.33956-9-andriy.shevchenko@linux.intel.com

drivers/mfd/intel_soc_pmic_bxtwc.c

@@ -334,7 +334,7 @@ static unsigned long bxtwc_reg_addr;
 static ssize_t addr_show(struct device *dev,
 			 struct device_attribute *attr, char *buf)
 {
-	return sprintf(buf, "0x%lx\n", bxtwc_reg_addr);
+	return sysfs_emit(buf, "0x%lx\n", bxtwc_reg_addr);
 }
 
 static ssize_t addr_store(struct device *dev,
@@ -362,7 +362,7 @@ static ssize_t val_show(struct device *dev,
 		return ret;
 	}
 
-	return sprintf(buf, "0x%02x\n", val);
+	return sysfs_emit(buf, "0x%02x\n", val);
 }
 
 static ssize_t val_store(struct device *dev,