Return 404 on command not found

We were returning 200 before. Even 404 is questionable in all cases, but
200 was totally wrong. Also match the case of all of the "Not found"
status messsages.

Signed-off-by: Dan McGee <dpmcgee@gmail.com>
Signed-off-by: Lars Hjemli <hjemli@gmail.com>

cgit.c

@@ -429,7 +429,7 @@ static int prepare_repo_cmd(struct cgit_context *ctx)
 		tmp = xstrdup(ctx->qry.head);
 		ctx->qry.head = ctx->repo->defbranch;
 		ctx->page.status = 404;
-		ctx->page.statusmsg = "not found";
+		ctx->page.statusmsg = "Not found";
 		cgit_print_http_headers(ctx);
 		cgit_print_docstart(ctx);
 		cgit_print_pageheader(ctx);
@@ -448,6 +448,8 @@ static void process_request(void *cbdata)
 	cmd = cgit_get_cmd(ctx);
 	if (!cmd) {
 		ctx->page.title = "cgit error";
+		ctx->page.status = 404;
+		ctx->page.statusmsg = "Not found";
 		cgit_print_http_headers(ctx);
 		cgit_print_docstart(ctx);
 		cgit_print_pageheader(ctx);