Remove unnecessary parentheses around return values in functions

This patch was generated by the following Perl code:

perl -i -pe 's/([^_])return\s*\(\s*([^(]+?)\s*\)s*;(\s+(\n))?/$1return $2;$4/g;'

Signed-off-by: Mikhail Gusarov <dottedmag@dottedmag.net>
Reviewed-by: Jamey Sharp <jamey@minilop.net>
Reviewed-by: Daniel Stone <daniel@fooishbar.org>
Signed-off-by: Keith Packard <keithp@keithp.com>

dix/ptrveloc.c

@@ -494,7 +494,7 @@ CalcTracker(DeviceVelocityPtr vel, int offset, int cur_t){
                       + vel->tracker[index].dy * vel->tracker[index].dy);
     int dtime = cur_t - vel->tracker[index].time;
     if(dtime > 0)
-	return (dist / dtime);
+	return dist / dtime;
     else
 	return 0;/* synonymous for NaN, since we're not C99 */
 }