kerndat: use PROC_SELF in loginuid test

Impact: little optimization
Signed-off-by: Dmitry Safonov <dsafonov@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

criu/kerndat.c

@@ -421,7 +421,7 @@ int kerndat_loginuid(bool only_dump)
 	kdat.has_loginuid = false;
 
 	/* No such file: CONFIG_AUDITSYSCALL disabled */
-	saved_loginuid = parse_pid_loginuid(getpid(), &ret, true);
+	saved_loginuid = parse_pid_loginuid(PROC_SELF, &ret, true);
 	if (ret < 0)
 		return 0;