staging : ion : Fix some checkpatch warnings and an error

Warning:
 - Unnecessary space after function pointer name
 - quoted string split across lines
 - fix alignment issues

Error:
 - return is not a function, parentheses are not required

Signed-off-by: Daeseok Youn <daeseok.youn@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>