gpiolib: Change bitmap allocation to kmalloc_array

We don't need to clear out these bits when we set them immediately
after. Use kmalloc_array() to skip clearing the bits.

Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
Tested-by: Timur Tabi <timur@codeaurora.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpiolib.c

@@ -341,7 +341,7 @@ static unsigned long *gpiochip_allocate_mask(struct gpio_chip *chip)
 {
 	unsigned long *p;
 
-	p = kcalloc(BITS_TO_LONGS(chip->ngpio), sizeof(long), GFP_KERNEL);
+	p = kmalloc_array(BITS_TO_LONGS(chip->ngpio), sizeof(*p), GFP_KERNEL);
 	if (!p)
 		return NULL;