sh: boards: Fix the cacography in irq.c
The word 'swtich' is wrong, so fix it. Signed-off-by: Tang Bin <tangbin@cmss.chinamobile.com> Reviewed-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> Signed-off-by: Rich Felker <dalias@libc.org>
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