Fixed an issue in the 'Invalid client hash' console message

- MD5 value was incorrectly printed as int (displaying a meaningless
  number) while it's in fact a string.

Signed-off-by: Haru <haru@dotalux.com>

src/login/login.c

@@ -1047,8 +1047,9 @@ int mmo_auth(struct login_session_data* sd, bool isServer) {
 
 			for( i = 0; i < 16; i++ )
 				sprintf(&smd5[i * 2], "%02x", sd->client_hash[i]);
+			smd5[32] = '\0';
 
-			ShowNotice("Invalid client hash (account: %s, pass: %s, sent md5: %d, ip: %s)\n", sd->userid, sd->passwd, smd5, ip);
+			ShowNotice("Invalid client hash (account: %s, pass: %s, sent md5: %s, ip: %s)\n", sd->userid, sd->passwd, smd5, ip);
 			return 5;
 		}
 	}