exec/tswap: Massage target_needs_bswap() definition

Invert target_needs_bswap() comparison to match the
COMPILING_PER_TARGET definition (2 lines upper).

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20241010175246.15779-2-philmd@linaro.org>
1 file changed