os-posix: Use qemu_log_enabled

Do not reference qemu_logfile directly;
use the predicate provided by qemu/log.h.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220417183019.755276-6-richard.henderson@linaro.org>
diff --git a/os-posix.c b/os-posix.c
index ee765f0..faf6e69 100644
--- a/os-posix.c
+++ b/os-posix.c
@@ -291,7 +291,7 @@
         dup2(fd, 0);
         dup2(fd, 1);
         /* In case -D is given do not redirect stderr to /dev/null */
-        if (!qemu_logfile) {
+        if (!qemu_log_enabled()) {
             dup2(fd, 2);
         }