futex: Test for pi_mutex on fault in futex_wait_requeue_pi()
If fixup_pi_state_owner() faults, pi_mutex may be NULL. Test for pi_mutex != NULL before testing the owner against current and possibly unlocking it. Signed-off-by: NDarren Hart <dvhart@linux.intel.com> Cc: Dave Jones <davej@redhat.com> Cc: Dan Carpenter <dan.carpenter@oracle.com> Cc: stable@vger.kernel.org Link: http://lkml.kernel.org/r/dc59890338fc413606f04e5c5b131530734dae3d.1342809673.git.dvhart@linux.intel.comSigned-off-by: NThomas Gleixner <tglx@linutronix.de>
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