signal: Use lockdep_assert_held instead of assert_spin_locked

The distinction is that assert_spin_locked() checks if the lock is
held *by*anyone* whereas lockdep_assert_held() asserts the current
context holds the lock.  Also, the check goes away if you build
without lockdep.

Suggested-by: Peter Zijlstra <[email protected]>
Link: https://lkml.kernel.org/r/Ympr/+PX4XgT/[email protected]
Tested-by: Kees Cook <[email protected]>
Reviewed-by: Oleg Nesterov <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: "Eric W. Biederman" <[email protected]>

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