Fix coverity warnings in VOM and VAPI

Change-Id: I0db55e079f9b1835668c8efe69e6e6f7f8437b00
Signed-off-by: Neale Ranns <neale.ranns@cisco.com>
diff --git a/src/vpp-api/vom/hw.hpp b/src/vpp-api/vom/hw.hpp
index 00ab2d6..ef34a4c 100644
--- a/src/vpp-api/vom/hw.hpp
+++ b/src/vpp-api/vom/hw.hpp
@@ -54,7 +54,8 @@
      * Constructor
      */
     item()
-      : item_rc(rc_t::UNSET)
+      : item_data()
+      , item_rc(rc_t::UNSET)
     {
     }
 
@@ -62,7 +63,8 @@
      * Constructor
      */
     item(rc_t rc)
-      : item_rc(rc)
+      : item_data()
+      , item_rc(rc)
     {
     }