remote: check for superfluous arguments in 'git remote add'

The 'git remote add' subcommand did not check for superfluous command
line arguments.  Make it so.

Signed-off-by: Thomas Rast <trast@inf.ethz.ch>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/remote.c

@@ -178,7 +178,7 @@ static int add(int argc, const char **argv)
 	argc = parse_options(argc, argv, NULL, options, builtin_remote_add_usage,
 			     0);
 
-	if (argc < 2)
+	if (argc != 2)
 		usage_with_options(builtin_remote_add_usage, options);
 
 	if (mirror && master)

t/t5505-remote.sh

@@ -1020,7 +1020,7 @@ test_extra_arg () {
 	"
 }
 
-test_extra_arg -f add nick url
+test_extra_arg add nick url
 test_extra_arg rename origin newname
 test_extra_arg remove origin
 test_extra_arg set-head origin master