Merge branch 'riscv-bpf-fix-uninitialized-symbol-retval_off'

Chenghao Duan says:

====================
riscv: bpf: Fix uninitialized symbol 'retval_off'

v2:
Adjust the commit log

URL for version v1:
https://lore.kernel.org/all/20250820062520.846720-1-duanchenghao@kylinos.cn/
====================

Link: https://patch.msgid.link/20250922062244.822937-1-duanchenghao@kylinos.cn
Signed-off-by: Alexei Starovoitov <ast@kernel.org>