patch: save 2 bytes in time.c

[walter harms]

hi list,
by not calling getpagesize() twice we can save 2 bytes !

please apply,
 wh


  text    data     bss     dec     hex filename
   4351       0       0    4351    10ff time.o
   4353       0       0    4353    1101 time.o.org
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