[master] b0af060fb simple fix for fedora/gcc-10.0.1: -Werror=format-overflow, by some reason hit on s390x

[Nils Goroll]

To summarize an IRC conversion with Dridi in case there are any other simple
minded people like me who admire pedants ;) :

- the publicly available *1) c99 draft states

  p.279

  If no l (length) modifier is present, the
  argument shall be a pointer to the
  initial element of an array of character type


  I read this as excluding NULL

- Dridis point is that the gcc warning should not be for -Wformat-overflow, but
rather for -Wformat / -Wnonnull

Nils

1) http://www.open-std.org/jtc1/sc22/WG14/www/docs/n1256.pdf

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