drivers/gpio/ml_ioh_gpio.c needs slab.h

alpha allmodconfig:

  drivers/gpio/ml_ioh_gpio.c: In function 'ioh_gpio_probe':
  drivers/gpio/ml_ioh_gpio.c:205: error: implicit declaration of function 'kzalloc'
  drivers/gpio/ml_ioh_gpio.c:205: warning: assignment makes pointer from integer without a cast

also fix this:

  drivers/gpio/ml_ioh_gpio.c:145: warning: 'ioh_gpio_save_reg_conf' defined but not used
  drivers/gpio/ml_ioh_gpio.c:154: warning: 'ioh_gpio_restore_reg_conf' defined but not used

Cc: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/gpio/ml_ioh_gpio.c

@@ -15,6 +15,7 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
  */
 #include <linux/kernel.h>
+#include <linux/slab.h>
 #include <linux/pci.h>
 #include <linux/gpio.h>
 
@@ -138,6 +139,7 @@ static int ioh_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)
 	return 0;
 }
 
+#ifdef CONFIG_PM
 /*
  * Save register configuration and disable interrupts.
  */
@@ -157,6 +159,7 @@ static void ioh_gpio_restore_reg_conf(struct ioh_gpio *chip)
 	/* to store contents of PM register */
 	iowrite32(chip->ioh_gpio_reg.pm_reg, &chip->reg->regs[chip->ch].pm);
 }
+#endif
 
 static void ioh_gpio_setup(struct ioh_gpio *chip, int num_port)
 {