time: ntp: micro-optimize ntp_update_offset()
Impact: cleanup, no functionality changed
The time_reftime update in ntp_update_offset() to xtime.tv_sec
is a convoluted way of saying that we want to freeze the frequency
and want the 'secs' delta to be 0. Also make this branch unlikely.
This shaves off 8 bytes from the code size:
text data bss dec hex filename
2504 114 136 2754 ac2 ntp.o.before
2496 114 136 2746 aba ntp.o.after
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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