Remove parentheses from return statements

No reason to use "return (x);" here. Refer to the GNU coding guidelines
for details. Created using following semantic patch:

    @@
    expression expr;
    @@

    - return (expr);
    + return expr;

Signed-off-by: Lukas Fleischer <calcurse@cryptocrack.de>

src/notify.c

@@ -112,7 +112,7 @@ notify_bar (void)
   display_bar = (nbar.show) ? 1 : 0;
   pthread_mutex_unlock (&nbar.mutex);
 
-  return (display_bar);
+  return display_bar;
 }
 
 /* Initialize the nbar variable used to store notification options. */