core: reactor: fix a typo in `smp_pollfn::poll()`
core: reactor: fix a typo in `smp_pollfn::poll()`

The function used `|` operator, but obviously should
use the `||` variant, instead.

Signed-off-by: Pavel Solodovnikov <2cf5887fafb117b7ff3e29b9720a7305c3313494@scylladb.com>
Message-Id: <20220407103906.569021-1-2cf5887fafb117b7ff3e29b9720a7305c3313494@scylladb.com>

scylladb/seastar,scylladb/seastar,scylladb/seastar,syuu1228/seastar,syuu1228/seastar,avikivity/seastar,syuu1228/seastar,avikivity/seastar,avikivity/seastar