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>

lockfile.c

@@ -97,4 +97,3 @@ void rollback_lock_file(struct lock_file *lk)
 		unlink(lk->filename);
 	lk->filename[0] = 0;
 }
-