staging: sm750fb: Add space around ':'

Add space around operator ':'. Problem found using
checkpatch.pl
CHECK: spaces preferred around that ':' (ctx:VxV)

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