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>

mi/mioverlay.c

@@ -444,7 +444,7 @@ miOverlayMarkOverlappedWindows(
 	MIOVERLAY_GET_SCREEN_PRIVATE(pScreen)->underlayMarked = TRUE;	
     }
 
-    return (underMarked || overMarked);
+    return underMarked || overMarked;
 }