Merge branch 'Fixes for kfunc-mod regressions and warnings'

Kumar Kartikeya says:

====================

This set includes fixes for two regressions and one build warning introduced by
the kfunc for modules series.

Changelog:
----------

v1 -> v2:
v1: https://lore.kernel.org/bpf/20211115191840.496263-1-memxor@gmail.com

 * Instead of demoting resolve_btfids warning to debug, only skip in case of
   set->cnt == 0.
====================

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>