[SRU][N:linux-bluefield][PATCH v1 0/1] RDMA/uverbs: Propagate errors from rdma_lookup_get_uobject()

[Stav Aviram]

BugLink: https://bugs.launchpad.net/bugs/2126876

SRU Justification:

[IMPACT]
Introduce an upstream patch series that was previously integrated into linux-bluefield-5.15 (Ubuntu 22.04 Jammy) into linux-bluefield-6.8 (Ubuntu 24.04 Noble), in order to minimize the divergence between the two kernel versions.
This patch ensures proper error propagation from rdma_lookup_get_uobject() instead of silently returning NULL on failures.

[FIX]
Cherry-pick the following patches:
https://patch.msgid.link/64f9d3711b183984e939962c2f83383904f97dfb.1740577869.git.leon@kernel.org

[TEST CASE]
Successfully compiled on linux-bluefield-6.8, master-next branch.

[Regression Potential]
Very low, as the series originates from upstream and has already been integrated into Jammy without reported issues.