qemu/bswap: Undefine CPU_CONVERT() once done

Better undefined macros once we are done with them,
like we do few lines later with DO_STN_LDN_P().

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20241003234211.53644-2-philmd@linaro.org>

include/qemu/bswap.h

@@ -140,6 +140,8 @@ CPU_CONVERT(le, 16, uint16_t)
 CPU_CONVERT(le, 32, uint32_t)
 CPU_CONVERT(le, 64, uint64_t)
 
+#undef CPU_CONVERT
+
 /*
  * Same as cpu_to_le{16,32,64}, except that gcc will figure the result is
  * a compile-time constant if you pass in a constant.  So this can be