WINGs: fix memory leak in requestHandler (Coverity #50135)

As pointed by Coverity, the data returned by WMGetTextSelectedStream are
actually a newly allocated buffer, so we need to release it when we're done
with it.

Signed-off-by: Christophe CURIS <christophe.curis@free.fr>

WINGs/wtext.c

@@ -2052,6 +2052,7 @@ static WMData *requestHandler(WMView * view, Atom selection, Atom target, void *
 		if (text) {
 			data = WMCreateDataWithBytes(text, strlen(text));
 			WMSetDataFormat(data, TYPETEXT);
+			wfree(text);
 		}
 		*type = target;
 		return data;