libtimeinstate: fix potential optimized variable

Per discussion at aosp/3077312/comment/38f6fa69_f6dee70c, the compiler
may optimize out the busy loop. Change to a volatile variable and
initialize to 1 so the *0 calc will not be optimized away.

Test: treehugger
Change-Id: Ic650b5c1b5ca9dcc1ed5817973f9ab831d944c99
Signed-off-by: Neill Kapron <nkapron@google.com>