percpu: fix locking regression in the failure path of pcpu_alloc()
percpu: fix locking regression in the failure path of pcpu_alloc()

While updating locking, b38d08f3181c ("percpu: restructure locking")
broke pcpu_create_chunk() creation path in pcpu_alloc().  It returns
without releasing pcpu_alloc_mutex.  Fix it.

Signed-off-by: Tejun Heo <546b05909706652891a87f7bfe385ae147f61f91@kernel.org>
Reported-by: Julia Lawall <018ee4f95fc49739477deedb13d2cd210889e607@lip6.fr>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs