nvmet-tcp: remove boilerplate code

[ Upstream commit 75011bd0f9c55db523242f9f9a0b0b826165f14b ]

Simplify the nvmet_tcp_handle_h2c_data_pdu() function by removing
boilerplate code.

BUG=b/478817254
TEST=presubmit
RELEASE_NOTE=None

cos-patch: security-moderate
Signed-off-by: Maurizio Lombardi <mlombard@redhat.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Keith Busch <kbusch@kernel.org>
Stable-dep-of: 32b63acd78f5 ("nvme-tcp: fix NULL pointer dereferences in nvmet_tcp_build_pdu_iovec")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Change-Id: Ie6d2782dcc90998b2e4d18654abe7202b57e7b55
Reviewed-on: https://cos-review.googlesource.com/c/third_party/kernel/+/132581
Reviewed-by: Kevin Berry <kpberry@google.com>
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
Reviewed-by: Daniel Velasquez <rdvelasquez@google.com>