default chroot to user' home if unset

gmid.c

@@ -270,6 +270,9 @@ main(int argc, char **argv)
 			fatalx("need root privileges");
 		if ((ps->ps_pw = getpwnam(conf->user)) == NULL)
 			fatalx("unknown user %s", conf->user);
+		if (*conf->chroot == '\0')
+			strlcpy(conf->chroot, ps->ps_pw->pw_dir,
+			    sizeof(conf->chroot));
 	}
 
 	ps->ps_instances[PROC_SERVER] = conf->prefork;

gmid.conf.5

@@ -126,6 +126,9 @@ directory, except for the
 and
 .Ic ocsp
 paths.
+Defaults to the
+.Ic user
+home directory, if provided.
 .It Ic prefork Ar number
 Run the specified number of server processes.
 This increases the performance and prevents delays when connecting to