Remove trailing whitespace.

Also, the script is a one-liner, stolen from [1]:

ack --print0 -l '[ \t]+$' | xargs -0 -n1 perl -pi -e 's/[ \t]+$//'

[1]
https://stackoverflow.com/questions/149057/how-to-remove-trailing-whitespace-of-all-files-recursively

src/wmspec.c

@@ -1686,7 +1686,7 @@ Bool wNETWMProcessClientMessage(XClientMessageEvent *event)
 				wwin->flags.maximized = maximized;
 				wUnmaximizeWindow(wwin);
 			} else {
-				wMaximizeWindow(wwin, wwin->flags.maximized, 
+				wMaximizeWindow(wwin, wwin->flags.maximized,
 						wGetHeadForWindow(wwin));
 			}
 		}