staging: speakup: (coding style) Add braces around all arms of if-statement

Fix checkpatch error: "braces {} should be used on all arms of this statement"
by adding the necessary braces around the "if".

Signed-off-by: Christian Colic <colic.christian@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>