Staging: sm750fb: Fixed indent of switch-case

Fixed indent of switch-case by adding space using tabs.
Problem found using checkpatch.pl
ERROR: space required after that ';' (ctx:VxV)

Signed-off-by: Amitoj Kaur Chawla <amitoj1606@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>