staging: sm750: comment formating

This patch fixes checkpatch.pl warnings / errors:

- "WARNING: please, no space before tabs"
- "ERROR: do not use C99 // comments"

Signed-off-by: Michel von Czettritz <michel.von.czettritz@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>