irqchip: Remove redundant semicolon after while

check drivers/irqchip with "make coccicheck M=drivers/irqchip/",
it will report unneeded semicolon like below, just remove them.

drivers/irqchip/irq-zevio.c:54:2-3: Unneeded semicolon
drivers/irqchip/irq-gic-v3.c:177:2-3: Unneeded semicolon
drivers/irqchip/irq-gic-v3.c:234:2-3: Unneeded semicolon

Signed-off-by: Daode Huang <huangdaode@hisilicon.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/1571300729-38822-1-git-send-email-huangdaode@hisilicon.com