util/log: Hoist the eval of is_daemonized in qemu_set_log_internal

Only call is_daemonized once.
We require the result on all paths after this point.

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: <20220417183019.755276-36-richard.henderson@linaro.org>

util/log.c

@@ -123,6 +123,7 @@ static bool qemu_set_log_internal(const char *filename, bool changed_name,
                                   int log_flags, Error **errp)
 {
     bool need_to_open_file;
+    bool daemonized;
     QemuLogFile *logfile;
 
     QEMU_LOCK_GUARD(&global_mutex);
@@ -178,7 +179,8 @@ static bool qemu_set_log_internal(const char *filename, bool changed_name,
      *     or to a file (if there is a filename).
      *   If we are daemonized, we will only log if there is a filename.
      */
-    need_to_open_file = log_flags && (!is_daemonized() || filename);
+    daemonized = is_daemonized();
+    need_to_open_file = log_flags && (!daemonized || filename);
 
     if (logfile && !need_to_open_file) {
         qatomic_rcu_set(&global_file, NULL);
@@ -196,7 +198,7 @@ static bool qemu_set_log_internal(const char *filename, bool changed_name,
                 return false;
             }
             /* In case we are a daemon redirect stderr to logfile */
-            if (is_daemonized()) {
+            if (daemonized) {
                 dup2(fileno(fd), STDERR_FILENO);
                 fclose(fd);
                 /* This will skip closing logfile in qemu_logfile_free. */
@@ -204,7 +206,7 @@ static bool qemu_set_log_internal(const char *filename, bool changed_name,
             }
         } else {
             /* Default to stderr if no log file specified */
-            assert(!is_daemonized());
+            assert(!daemonized);
             fd = stderr;
         }