arm: arm-v7m: fix error path when enabling irq lines
arm: arm-v7m: fix error path when enabling irq lines

IRQ were never restored when an error occured during the enablement of IRQ lines

Signed-off-by: Fabien Parent <2a93cde040adee823a667eed2882d05f12a84573@gmail.com>

mtitinger/phabos,mtitinger/phabos