crc: remove gratuitous trailing whitespace.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

ccan/crc/crc.c

@@ -9,7 +9,7 @@
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option) 
+ * Software Foundation; either version 2 of the License, or (at your option)
  * any later version. */
 
 /* crc64 code taken from Jacksum version 1.7.0 - checksum utility in Java