nvme: explicitly set non-error for directives

Stream directives is an optional feature. It is not an error if a
controller doesn't support as many as the kernel can optionally use.
Explicitly set the non-error return value on this condition with a
comment explaining why.

Note, the return value was already 0 in this condition, so the setting
is redundant. This patch should just silence bots that falsely believe
the condition contains an error omission.

Signed-off-by: Keith Busch <[email protected]>
Reviewed-by: Chaitanya Kulkarni <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>

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