[PATCH 5.15.y] nvmet-tcp: fix use-before-check of sg in bounds validation

[Sasha Levin]

On Sat, Apr 05, 2026 at 02:53:36AM +0530, Cengiz Can wrote:
> Fix this by moving the iov_len declaration to function scope and
> keeping the assignment after the bounds checks, matching the ordering
> in mainline.

Queued for 5.15, thanks.

-- Sasha