iphlapi: Fix some leaks (coverity).

dlls/iphlpapi/ifenum.c

@@ -741,6 +741,8 @@ DWORD getIPAddrTable(PMIB_IPADDRTABLE *ppIpAddrTable, HANDLE heap, DWORD flags)
            ifp->ifa_addr);
           i++;
         }
+        if (ret)
+          HeapFree(GetProcessHeap(), 0, *ppIpAddrTable);
       }
       else
         ret = ERROR_OUTOFMEMORY;
@@ -928,6 +930,8 @@ DWORD getIPAddrTable(PMIB_IPADDRTABLE *ppIpAddrTable, HANDLE heap, DWORD flags)
            &ifr->ifr_addr);
           i++;
         }
+        if (ret)
+          HeapFree(GetProcessHeap(), 0, *ppIpAddrTable);
       }
       else
         ret = ERROR_OUTOFMEMORY;

dlls/iphlpapi/iphlpapi_main.c

@@ -784,6 +784,7 @@ static ULONG adapterAddressesFromIndex(ULONG family, ULONG flags, IF_INDEX index
     }
     if (ret)
     {
+        HeapFree(GetProcessHeap(), 0, v4addrs);
         HeapFree(GetProcessHeap(), 0, routeTable);
         return ret;
     }