svcrdma: Catch another Reply chunk overflow case

[ Upstream commit e5decb2e ]

When space in the Reply chunk runs out in the middle of a segment,
we end up passing a zero-length SGL to rdma_rw_ctx_init(), and it
oopses.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Stable-dep-of: ffc17e14 ("platform/x86: dell-smbios: Fix error path in dell_smbios_init()")
Signed-off-by: Sasha Levin <sashal@kernel.org>