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>

tree-walk.c

@@ -206,4 +206,3 @@ int get_tree_entry(const unsigned char *tree_sha1, const char *name, unsigned ch
 	free(tree);
 	return retval;
 }
-