memory: ti-aemif: fix a potential NULL-pointer dereference

memory: ti-aemif: fix a potential NULL-pointer dereference

commit 6b45a2b1c0bc2aec84d1c56a1976ca9c8a621ecb upstream.

Platform data pointer may be NULL. We check it everywhere but in one
place. Fix it.

Fixes: 8af70cd2ca50 ("memory: aemif: add support for board files")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Cc: stable@vger.kernel.org
Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>