hwmon: Add missing inclusions of <linux/err.h>

These drivers use IS_ERR so they should include <linux/err.h>.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Acked-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Luca Tettamanti <kronos.it@gmail.com>
Cc: Henrik Rydberg <rydberg@euromail.se>

drivers/hwmon/acpi_power_meter.c

@@ -29,6 +29,7 @@
 #include <linux/kdev_t.h>
 #include <linux/sched.h>
 #include <linux/time.h>
+#include <linux/err.h>
 #include <acpi/acpi_drivers.h>
 #include <acpi/acpi_bus.h>
 

drivers/hwmon/applesmc.c

@@ -43,6 +43,7 @@
 #include <linux/leds.h>
 #include <linux/hwmon.h>
 #include <linux/workqueue.h>
+#include <linux/err.h>
 
 /* data port used by Apple SMC */
 #define APPLESMC_DATA_PORT	0x300

drivers/hwmon/asus_atk0110.c

@@ -15,6 +15,7 @@
 #include <linux/slab.h>
 #include <linux/dmi.h>
 #include <linux/jiffies.h>
+#include <linux/err.h>
 
 #include <acpi/acpi.h>
 #include <acpi/acpixf.h>

drivers/hwmon/ibmaem.c

@@ -36,6 +36,7 @@
 #include <linux/platform_device.h>
 #include <linux/math64.h>
 #include <linux/time.h>
+#include <linux/err.h>
 
 #define REFRESH_INTERVAL	(HZ)
 #define IPMI_TIMEOUT		(30 * HZ)

drivers/hwmon/ibmpex.c

@@ -26,6 +26,7 @@
 #include <linux/jiffies.h>
 #include <linux/mutex.h>
 #include <linux/slab.h>
+#include <linux/err.h>
 
 #define REFRESH_INTERVAL	(2 * HZ)
 #define DRVNAME			"ibmpex"

drivers/hwmon/ultra45_env.c

@@ -12,6 +12,7 @@
 #include <linux/io.h>
 #include <linux/hwmon.h>
 #include <linux/hwmon-sysfs.h>
+#include <linux/err.h>
 
 #define DRV_MODULE_VERSION	"0.1"