Calling client_add_key as follows

  client_add_key -

will fail. However using an explicit -shared option, like this:

  client_add_key -shared -

will succeed. This is caused by a failure to parse the - key token, which is
mistaken for the first character of an option argument.

The client_add_key command also returns a spurious "success" message when a
malformed option is supplied.

This patch fixes both issues.

Signed-off-by: Simon Dawson <spdawson@gmail.com>

diff -Nurp a/server/commands/client_commands.c b/server/commands/client_commands.c
--- a/server/commands/client_commands.c	2011-08-14 13:29:16.000000000 +0100
+++ b/server/commands/client_commands.c	2012-10-05 07:50:40.357795535 +0100
@@ -181,7 +181,7 @@ client_add_key_func(Client *c, int argc,
 	}
 
 	argnr = 1;
-	if (argv[argnr][0] == '-') {
+	if (argv[argnr][0] == '-' && strcmp(argv[argnr], "-") != 0) {
 		if (strcmp( argv[argnr], "-shared") == 0) {
 			exclusively = 0;
 		}
@@ -190,6 +190,7 @@ client_add_key_func(Client *c, int argc,
 		}
 		else {
 			sock_printf_error(c->sock, "Invalid option: %s\n", argv[argnr]);
+			return 0;
 		}
 		argnr++;
 	}