Suppress warnings from "git var -l"

For scripts using "git var -l" to read all logical variables at
once, not all per-variable warnings will be relevant.  So suppress
them.

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

ident.c

@@ -205,7 +205,7 @@ const char *fmt_ident(const char *name, const char *email,
 		if ((warn_on_no_name || error_on_no_name) &&
 		    name == git_default_name && env_hint) {
 			fprintf(stderr, env_hint, au_env, co_env);
-			env_hint = NULL; /* warn only once, for "git var -l" */
+			env_hint = NULL; /* warn only once */
 		}
 		if (error_on_no_name)
 			die("empty ident %s <%s> not allowed", name, email);

var.c

@@ -22,7 +22,7 @@ static void list_vars(void)
 {
 	struct git_var *ptr;
 	for (ptr = git_vars; ptr->read; ptr++)
-		printf("%s=%s\n", ptr->name, ptr->read(IDENT_WARN_ON_NO_NAME));
+		printf("%s=%s\n", ptr->name, ptr->read(0));
 }
 
 static const char *read_var(const char *var)