ipmi_fru: drop unused sd_bus pointer

Drop unused sd_bus pointer from fru_info class.

Change-Id: Id93412c17d15118e8e6f66736c9dc74289392fa4
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/fru-area.hpp b/fru-area.hpp
index 038e237..fce830d 100644
--- a/fru-area.hpp
+++ b/fru-area.hpp
@@ -51,16 +51,13 @@
     // fru inventory dbus interface name
     std::string iv_intf_name;
 
-    // sd_bus handle
-    sd_bus* iv_bus_type = nullptr;
-
     // Default constructor disabled.
     ipmi_fru();
 
   public:
     // constructor
     ipmi_fru(const uint8_t fruid, const ipmi_fru_area_type type,
-             sd_bus* bus_type, bool bmc_fru = false);
+             bool bmc_fru = false);
 
     // Destructor
     virtual ~ipmi_fru();