objtool/klp: Run the klp tests under set -u

Most of these assertions end in a grep, and an empty pattern matches
anything.  So a mistyped variable name in a test does not fail: it expands
to nothing, the grep succeeds, and the test reports a pass having checked
nothing.  assert_section "$sectoin_nmae" becomes a search for two adjacent
spaces, which readelf's column padding satisfies on every line.

Refuse unset variables.  lib.sh guards the few genuinely optional
expansions it has with ${x:-}.

Signed-off-by: Song Liu <song@kernel.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Assisted-by: Claude:claude-opus-5
Link: https://patch.msgid.link/20260916184351.2720310-9-song@kernel.org

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