[PATCHv2 02/17] nvme: add Clang context annotations for nvme_passthru_{start|stop}

[Christoph Hellwig]

Note on the subject (also the following ones):  please just say context
analysis.  Currently only clang implements them, but that's an
implementation detail.

Otherwise looks good:

Reviewed-by: Christoph Hellwig <hch at lst.de>