War on whitespace

This uses "git-apply --whitespace=strip" to fix whitespace errors that have
crept in to our source files over time.  There are a few files that need
to have trailing whitespaces (most notably, test vectors).  The results
still passes the test, and build result in Documentation/ area is unchanged.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

pkt-line.c

@@ -5,7 +5,7 @@
  * Write a packetized stream, where each line is preceded by
  * its length (including the header) as a 4-byte hex number.
  * A length of 'zero' means end of stream (and a length of 1-3
- * would be an error). 
+ * would be an error).
  *
  * This is all pretty stupid, but we use this packetized line
  * format to make a streaming format possible without ever