Staging: iio: pull in slab.h for kmalloc funcs

These drivers use kzalloc() but don't include slab.h.  They currently
build though because the spi.h header will pull in slab.h for us.  But
rather than rely on that behavior forever, include slab.h explicitly.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Acked-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/iio/accel/adis16209_core.c

@@ -14,7 +14,7 @@
 #include <linux/device.h>
 #include <linux/kernel.h>
 #include <linux/spi/spi.h>
-
+#include <linux/slab.h>
 #include <linux/sysfs.h>
 #include <linux/list.h>
 

drivers/staging/iio/accel/adis16209_ring.c

@@ -6,6 +6,7 @@
 #include <linux/device.h>
 #include <linux/kernel.h>
 #include <linux/spi/spi.h>
+#include <linux/slab.h>
 #include <linux/sysfs.h>
 #include <linux/list.h>
 

drivers/staging/iio/accel/adis16220_core.c

@@ -14,7 +14,7 @@
 #include <linux/device.h>
 #include <linux/kernel.h>
 #include <linux/spi/spi.h>
-
+#include <linux/slab.h>
 #include <linux/sysfs.h>
 #include <linux/list.h>
 

drivers/staging/iio/accel/adis16240_core.c

@@ -14,7 +14,7 @@
 #include <linux/device.h>
 #include <linux/kernel.h>
 #include <linux/spi/spi.h>
-
+#include <linux/slab.h>
 #include <linux/sysfs.h>
 #include <linux/list.h>
 

drivers/staging/iio/accel/adis16240_ring.c

@@ -6,6 +6,7 @@
 #include <linux/device.h>
 #include <linux/kernel.h>
 #include <linux/spi/spi.h>
+#include <linux/slab.h>
 #include <linux/sysfs.h>
 #include <linux/list.h>
 

drivers/staging/iio/gyro/adis16260_core.c

@@ -14,7 +14,7 @@
 #include <linux/device.h>
 #include <linux/kernel.h>
 #include <linux/spi/spi.h>
-
+#include <linux/slab.h>
 #include <linux/sysfs.h>
 #include <linux/list.h>
 

drivers/staging/iio/gyro/adis16260_ring.c

@@ -6,6 +6,7 @@
 #include <linux/device.h>
 #include <linux/kernel.h>
 #include <linux/spi/spi.h>
+#include <linux/slab.h>
 #include <linux/sysfs.h>
 #include <linux/list.h>
 

drivers/staging/iio/imu/adis16300_core.c

@@ -14,7 +14,7 @@
 #include <linux/device.h>
 #include <linux/kernel.h>
 #include <linux/spi/spi.h>
-
+#include <linux/slab.h>
 #include <linux/sysfs.h>
 #include <linux/list.h>
 

drivers/staging/iio/imu/adis16300_ring.c

@@ -6,6 +6,7 @@
 #include <linux/device.h>
 #include <linux/kernel.h>
 #include <linux/spi/spi.h>
+#include <linux/slab.h>
 #include <linux/sysfs.h>
 #include <linux/list.h>
 

drivers/staging/iio/imu/adis16350_core.c

@@ -14,7 +14,7 @@
 #include <linux/device.h>
 #include <linux/kernel.h>
 #include <linux/spi/spi.h>
-
+#include <linux/slab.h>
 #include <linux/sysfs.h>
 #include <linux/list.h>
 

drivers/staging/iio/imu/adis16350_ring.c

@@ -6,6 +6,7 @@
 #include <linux/device.h>
 #include <linux/kernel.h>
 #include <linux/spi/spi.h>
+#include <linux/slab.h>
 #include <linux/sysfs.h>
 #include <linux/list.h>
 

drivers/staging/iio/imu/adis16400_core.c

@@ -21,7 +21,7 @@
 #include <linux/device.h>
 #include <linux/kernel.h>
 #include <linux/spi/spi.h>
-
+#include <linux/slab.h>
 #include <linux/sysfs.h>
 #include <linux/list.h>
 

drivers/staging/iio/imu/adis16400_ring.c

@@ -6,6 +6,7 @@
 #include <linux/device.h>
 #include <linux/kernel.h>
 #include <linux/spi/spi.h>
+#include <linux/slab.h>
 #include <linux/sysfs.h>
 #include <linux/list.h>