Fixes for option parsing

Make sure "git show" always show the header, regardless of whether there
is a diff or not.

Also, make sure "always_show_header" actually works, since generate_header
only tested it in one out of three return paths.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>

git.c

@@ -373,6 +373,7 @@ static int cmd_show(int argc, const char **argv, char **envp)
 	rev.diffopt.recursive = 1;
 	rev.combine_merges = 1;
 	rev.dense_combined_merges = 1;
+	rev.always_show_header = 1;
 	rev.ignore_merges = 0;
 	rev.no_walk = 1;
 	return cmd_log_wc(argc, argv, envp, &rev);