staging: speakup: spaces preferred around operator

Fixed the checkpatch.pl issues like:
CHECK: spaces preferred around that '&' (ctx:VxV)
CHECK: spaces preferred around that '|' (ctx:VxV)
CHECK: spaces preferred around that '-' (ctx:VxV)
CHECK: spaces preferred around that '+' (ctx:VxV)
etc.

Signed-off-by: Arushi Singhal <arushisinghal19971997@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>