staging: sm750: fix whitespace around braces

Fix multiple similar checkpatch.pl errors:

- "ERROR: space required before the open parenthesis '('"
- "ERROR: space required before the open brace '{'"
- "ERROR: space prohibited after that open parenthesis '('"
- "ERROR: space prohibited before that close parenthesis ')'"
Signed-off-by: Michel von Czettritz <michel.von.czettritz@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>