objtool/klp: Fix relocation conversion failures for R_X86_64_NONE

objtool/klp: Fix relocation conversion failures for R_X86_64_NONE

Objtool has some hacks which NOP out certain calls/jumps and replace
their relocations with R_X86_64_NONE.  The klp-diff relocation
extraction code will error out when trying to copy these relocations due
to their negative addend, which would only makes sense for a PC-relative
branch instruction.  Just ignore them.

Fixes: dd590d4d57eb ("objtool/klp: Introduce klp diff subcommand for diffing object files")
Acked-by: Song Liu <song@kernel.org>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>