staging: sep: fix possible memory leak in sep_prepare_input_dma_table()

'lli_array_ptr' etc. are malloced in sep_prepare_input_dma_table() and should
be freed before leaving from the error handling case, otherwise it will cause
memory leak.

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>