timer: Avoid reading uninitialized data
timer->expires may be uninitialized, so check timer_pending() before touching timer->expires to pacify kmemcheck. Signed-off-by: Pavel Roskin <proski@gnu.org> LKML-Reference: <20090718204602.5191.360.stgit@mj.roinet.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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