gpio: pisosr: utilize the for_each_set_clump8 macro

Replace verbose implementation in get_multiple callback with
for_each_set_clump8 macro to simplify code and improve clarity.

Link: http://lkml.kernel.org/r/8a39[e-mail]
Signed-off-by: William Breathitt Gray <[e-mail]>
Cc: Andy Shevchenko <[e-mail]>
Cc: Morten Hein Tiljeset <[e-mail]>
Cc: Sean Nyekjaer <[e-mail]>
Cc: Arnd Bergmann <[e-mail]>
Cc: Bartosz Golaszewski <[e-mail]>
Cc: Geert Uytterhoeven <[e-mail]>
Cc: Geert Uytterhoeven <[e-mail]>
Cc: Linus Walleij <[e-mail]>
Cc: Lukas Wunner <[e-mail]>
Cc: Masahiro Yamada <[e-mail]>
Cc: Mathias Duckeck <[e-mail]>
Cc: Phil Reid <[e-mail]>
Cc: Rasmus Villemoes <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/gpio/gpio-pisosr.c

···
 				    unsigned long *mask, unsigned long *bits)
 {
 	struct pisosr_gpio *gpio = gpiochip_get_data(chip);
-	unsigned int nbytes = DIV_ROUND_UP(chip->ngpio, 8);
-	unsigned int i, j;
+	unsigned long offset;
+	unsigned long gpio_mask;
+	unsigned long buffer_state;
 
 	pisosr_gpio_refresh(gpio);
 
 	bitmap_zero(bits, chip->ngpio);
-	for (i = 0; i < nbytes; i++) {
-		j = i / sizeof(unsigned long);
-		bits[j] |= ((unsigned long) gpio->buffer[i])
-			   << (8 * (i % sizeof(unsigned long)));
+	for_each_set_clump8(offset, gpio_mask, mask, chip->ngpio) {
+		buffer_state = gpio->buffer[offset / 8] & gpio_mask;
+		bitmap_set_value8(bits, buffer_state, offset);
 	}
 
 	return 0;