ALSA: pcxhr: fix trivial typo

Signed-off-by: Tim Blechmann <tim@klingt.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/pcxhr/pcxhr_core.h

 /*
  * Driver for Digigram pcxhr compatible soundcards
  *
- * low level interface with interrupt ans message handling
+ * low level interface with interrupt and message handling
  *
  * Copyright (c) 2004 by Digigram <alsa@digigram.com>
  *