[PATCH V2] tdb: introduce tdb_chainlock_read_nonblock(), a nonblock, variant of tdb_chainlock_read()

[Alexander Drozdov]

tdb has nonblock variants for many lock functions, for example:

tdb_lockall() / tdb_lockall_nonblock()
tdb_lockall_read() / tdb_lockall_read_nonblock()
tdb_chainlock() / tdb_chainlock_nonblock()

But there hasn't been nonblock variant for tdb_chainlock_read().
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