[patch] Backtrace prints wrong argument value

[Pedro Alves]

Pedro Alves wrote:

> The fix is easy - inline the STRING_COMMA_LEN(NULL) cases.
> Wait, a quick 'grep STRING_COMMA_LEN * -rn | grep NULL' shows
> there aren't any?
>

:) Forgot to grep in ld.

There are only 6 of those in ld/pe-dll.c in a not-so-recent binutils checkout I
have here, so it should be painless.

Cheers,
Pedro Alves