[PATCH] use list_for_each_entry() for iteration in Prism 54 driver

Use list_for_each_entry() instead of manual iteration and substitute a
list_for_each_safe() loop with list_for_each_entry_safe()

Signed-off-by: Matthias Kaehlcke <matthias.kaehlcke@gmail.com>
Cc: Christoph Hellwig <hch@lst.de>
Acked-by: Luis R. Rodriguez <mcgrof@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>