Staging: sep: Fix missing space after return type in sep_crypto.c

This patch fixes the following checkpatch.pl warning in sep_main.c
WARNING: Missing space after return type

Signed-off-by: Monam Agarwal <monamagarwal123@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>