NET-3c59x: turn local_save_flags() + local_irq_disable() into local_irq_save()

drivers/net/3c59x.c::poll_vortex() contains local_irq_disable() after
local_save_flags().  Turn it into local_irq_save().

Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>