fault_inject: Don't rely on "return value" from WRITE_ONCE()
It's a bit weird that WRITE_ONCE() evaluates to the value it stores and
it's different to smp_store_release(), which can't be used this way.
In preparation for preventing this in WRITE_ONCE(), change the fault
injection code to use a local variable instead.
Cc: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Will Deacon <will@kernel.org>
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