chdir: need to check return value

otherwise it won't compile:

util.c: In function ‘cr_daemon’:
util.c:594:8: error: ignoring return value of ‘chdir’, declared
with attribute warn_unused_result [-Werror=unused-result]
   chdir("/");
        ^
Signed-off-by: Tikhomirov Pavel <snorcht@gmail.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

util.c

@@ -591,7 +591,8 @@ int cr_daemon(int nochdir, int noclose)
 
 	setsid();
 	if (!nochdir)
-		chdir("/");
+		if (chdir("/") == -1)
+			pr_perror("Can't change directory");
 	if (!noclose) {
 		int fd;