xcopy: Allocate more space for the W buffer (Coverity).

programs/xcopy/xcopy.c

@@ -114,7 +114,7 @@ static int __cdecl XCOPY_wprintf(const WCHAR *format, ...) {
      */
 
     if (!output_bufW) output_bufW = HeapAlloc(GetProcessHeap(), 0,
-                                              MAX_WRITECONSOLE_SIZE);
+                                              MAX_WRITECONSOLE_SIZE*sizeof(WCHAR));
     if (!output_bufW) {
       WINE_FIXME("Out of memory - could not allocate 2 x 64K buffers\n");
       return 0;