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Functions annotated with 'warn_unused_result' cannot be cast to (void) to silence the compiler. Add the ignore_value() macro which tricks the compiler into thinking the result is genuinely used, avoiding the need for manual workarounds where the return value is intentionally ignored. This clever macro is derived from one originating with the GNULIB project: https://gitweb.git.savannah.gnu.org/gitweb/?p=gnulib.git;a=blob;f=lib/ignore-value.h;hb=HEAD but simplified since we don't need compat with old GCC and optimizing on clang is overkill. Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com> Message-id: 20261102142844.3464712-2-berrange@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>