irqchip/stm32-exti: Fix minor indentation issue

Commit 046a6ee2343b ("irqchip: Bulk conversion to
generic_handle_domain_irq()") incorrectly added a leading space character
in the line indentation.

Use only TAB for indentation, removing the leading space.

Signed-off-by: Antonio Borneo <[e-mail]>
Signed-off-by: Thomas Gleixner <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/irqchip/irq-stm32-exti.c

···
 		while ((pending = stm32_exti_pending(gc))) {
 			for_each_set_bit(n, &pending, IRQS_PER_BANK)
 				generic_handle_domain_irq(domain, irq_base + n);
- 		}
+		}
 	}
 
 	chained_irq_exit(chip, desc);