drivers:isdn:istream.c Fix typo pice to piece

The below patch changes a typo "pice" to "piece"
Signed-off-by: NJustin P. Mattock <justinmattock@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/isdn/hardware/eicon/istream.c

@@ -62,7 +62,7 @@ void diva_xdi_provide_istream_info (ADAPTER* a,
   stream interface.
   If synchronous service was requested, then function
   does return amount of data written to stream.
-  'final' does indicate that pice of data to be written is
+  'final' does indicate that piece of data to be written is
   final part of frame (necessary only by structured datatransfer)
   return  0 if zero lengh packet was written
   return -1 if stream is full