Add macthing 'va_end()' to the 'va_start()' in daemonize().

Not that it makes any difference on x86, but there may be
architectures that actually need it.

kernel/exit.c

@@ -308,6 +308,7 @@ void daemonize(const char *name, ...)
 
 	va_start(args, name);
 	vsnprintf(current->comm, sizeof(current->comm), name, args);
+	va_end(args);
 
 	/*
 	 * If we were started as result of loading a module, close all of the