gpiolib: Join string literals back

For easy grepping on debug purposes join string literals back in the
messages.

While here, fix couple of small indentation issues.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpiolib.c

@@ -1664,8 +1664,7 @@ static void gpiochip_set_cascaded_irqchip(struct gpio_chip *gpiochip,
 	if (parent_handler) {
 		if (gpiochip->can_sleep) {
 			chip_err(gpiochip,
-				 "you cannot have chained interrupts on a "
-				 "chip that may sleep\n");
+				 "you cannot have chained interrupts on a chip that may sleep\n");
 			return;
 		}
 		/*
@@ -1850,8 +1849,7 @@ static int gpiochip_add_irqchip(struct gpio_chip *gpiochip,
 		return 0;
 
 	if (gpiochip->irq.parent_handler && gpiochip->can_sleep) {
-		chip_err(gpiochip, "you cannot have chained interrupts on a "
-			 "chip that may sleep\n");
+		chip_err(gpiochip, "you cannot have chained interrupts on a chip that may sleep\n");
 		return -EINVAL;
 	}