Remove trailing white space.

Change-Id: I8cdbde058c7ebb9aaaac4739e9a5c206e0d2c919
Reviewed-on: https://code.wireshark.org/review/21484
Reviewed-by: Guy Harris <guy@alum.mit.edu>

wiretap/vwr.c

@@ -2894,7 +2894,7 @@ static void setup_defaults(vwr_t *vwr, guint16 fpga)
              *    2 bytes of MSDU length + other bits
              *    1 byte of XXX;
              *    2 bytes of VCID.
-             *  
+             *
              * The 12 is for 11 bytes of PLCP and 1 byte of pad
              * before the data.
              */