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fdio: Avoid relying on VLAs or gcc-specific constant folding
Formally, `strlen("x")` is not a constant expression, although gcc can and does optimize it to a constant expression in simple cases. clang 19.1.6 warns about this usage. Replace it with the size of a static array (1 more than the strlen of its contents), which is unambiguously a constant expression. Resolves: https://gitlab.gnome.org/GNOME/libglnx/-/issues/5 Signed-off-by:Simon McVittie <smcv@collabora.com>
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