staging: ccree: switch spaces to tabs

ssi_fips.c:

fixing checkpatch.pl errors:

ERROR: code indent should use tabs where possible
+        int rc = 0;$

ERROR: code indent should use tabs where possible
+        int rc = 0;$
Signed-off-by: Connor Kelleher <connor.r.kelleher@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>