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Currently, unknown relocation types are just skipped.

The value of r_addend is only needed to get the symbol name in case
is_valid_name(elf, sym) returns false.

Even if we do not know how to calculate r_addend, we should continue.
At worst, we will get "(unknown)" as the symbol name, but it is better
than failing to detect section mismatches.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>