Fix log printing always shows the role as child under daemonize

In valkey-io#1282, we init server.pid earlier to keep log message role
consistent, but we forgot to consider daemonize. In daemonize
mode, we will always print the child role.

We need to reset server.pid after daemonize(), otherwise the
log printing role will always be the child.

Signed-off-by: Binbin <binloveplay1314@qq.com>

src/server.c

@@ -7064,7 +7064,12 @@ __attribute__((weak)) int main(int argc, char **argv) {
     /* Daemonize if needed */
     server.supervised = serverIsSupervised(server.supervised_mode);
     int background = server.daemonize && !server.supervised;
-    if (background) daemonize();
+    if (background) {
+        /* We need to reset server.pid after daemonize(), otherwise the
+         * log printing role will always be the child. */
+        daemonize();
+        server.pid = getpid();
+    }
 
     serverLog(LL_NOTICE, "oO0OoO0OoO0Oo Valkey is starting oO0OoO0OoO0Oo");
     serverLog(LL_NOTICE, "Valkey version=%s, bits=%d, commit=%s, modified=%d, pid=%d, just started", VALKEY_VERSION,