[MIPS] i8253: make the pit_clockevent variable static
The pit_clockevent symbol is needlessly defined global. This patch makes that variable static. Spotted by sparse. Compile-tested using Malta defconfig. Signed-off-by: NDmitri Vorobiev <dmitri.vorobiev@movial.fi> Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
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