readline: Add missing GCC_FMT_ATTR
This fixes a compiler warning with -Werror=missing-format-attribute and allows improved compiler checks for variable argument lists. Signed-off-by: NStefan Weil <sw@weilnetz.de> Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com> Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>
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