Pre-existing violations in this file, reported by checkpatch because the
preceding commit touches it:
nrf53_gpiote.c:185: Missing blank line after declarations
nrf53_gpiote.c:213: Bad alignment
nrf53_gpiote.c:216: Bad alignment
nrf53_gpiote.c:259: Bad right brace alignment
Add the blank line after the declarations in the channel-callback block,
indent the two `break;` statements into their case bodies, and align the
brace closing the per-port `for` loop with its opening at line 209 (it
sat at seven spaces, so neither the loop's eight nor anything else).
Whitespace only — no functional change, brace count unchanged.
Signed-off-by: AlmAck <gluca86@gmail.com>