s5j/timerisr: tidy up a bit
s5j/timerisr: tidy up a bit

Fixes trivial violations to the coding style and removes unnecessary
code lines that are not in use.

Change-Id: Ibb8d603997557a97abf027ec2a16404aeedd0e4d
Signed-off-by: Heesub Shin <45471ea77bd08f3d26635f3f5adb40ba41250a2b@samsung.com>

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