Remove extra whitespaces/tabs before EOL.

find . -name '*.[ch]' | xargs perl -pi -e 's/\t+$//; s/ +$//'

Thanks to Ludovic.

libnfc/drivers/acr122_pcsc.c

@@ -1,15 +1,15 @@
 /*-
  * Public platform independent Near Field Communication (NFC) library
- * 
+ *
  * Copyright (C) 2009, Roel Verdult
  * Copyright (C) 2011, Romain Tartiere, Romuald Conty
  * Copyright (C) 2012, Romuald Conty
- * 
+ *
  * This program is free software: you can redistribute it and/or modify it
  * under the terms of the GNU Lesser General Public License as published by the
  * Free Software Foundation, either version 3 of the License, or (at your
  * option) any later version.
- * 
+ *
  * This program is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
@@ -282,7 +282,7 @@ acr122_pcsc_open (const nfc_connstring connstring)
   pn53x_data_new (pnd, &acr122_pcsc_io);
 
   SCARDCONTEXT *pscc;
-  
+
   log_put (LOG_CATEGORY, NFC_PRIORITY_TRACE, "Attempt to open %s", ndd.pcsc_device_name);
   // Test if context succeeded
   if (!(pscc = acr122_pcsc_get_scardcontext ()))