cleanup: Remove all warning errors for the Meson build support
Remove all the build warning to prepare for the meson build.
Meson build will be in
https://gerrit.openbmc-project.xyz/c/openbmc/phosphor-host-ipmid/+/47748
Tested:
Ipmi command works fine the cleanup.
```
$ systemctl status phosphor-ipmi-host
● phosphor-ipmi-host.service - Phosphor Inband IPMI
Loaded: loaded (/lib/systemd/system/phosphor-ipmi-host.service; enabled; vendor preset: enabled)
Active: active (running) since Thu 1970-01-08 21:20:56 UTC; 21s ago
Main PID: 24987 (ipmid)
CGroup: /system.slice/phosphor-ipmi-host.service
└─24987 /tmp/ipmid
Jan 08 21:20:56 $HOST ipmid[24987]: Registering OEM:[0X002B79], Cmd:[0X30] for Ethstats Commands
Jan 08 21:20:56 $HOST ipmid[24987]: Registering OEM:[0X00C2CF], Cmd:[0X30] for Ethstats Commands
Jan 08 21:20:56 $HOST ipmid[24987]: Registering OEM:[0X002B79], Cmd:[0X32] for Sys Commands
Jan 08 21:20:56 $HOST ipmid[24987]: Registering OEM:[0X002B79], Cmd:[0X02] for I2C
Jan 08 21:20:56 $HOST ipmid[24987]: Registering OEM:[0X00C2CF], Cmd:[0X02] for I2C
Jan 08 21:20:56 $HOST ipmid[24987]: I2C_WHITELIST_CHECK is disabled, do not populate whitelist
Jan 08 21:20:56 $HOST ipmid[24987]: Registering OEM:[0X00C2CF], Cmd:[0X04] for Manual Zone Control
Jan 08 21:20:56 $HOST systemd[1]: Started Phosphor Inband IPMI.
Jan 08 21:20:56 $HOST ipmid[24987]: Loading whitelist filter
Jan 08 21:20:56 $HOST ipmid[24987]: Set restrictedMode = true
(reverse-i-search)`ipmi': systemctl status phosphor-^Cmi-host
$ ipmitool mc info
Device ID : 32
Device Revision : 1
Firmware Revision : 0.00
IPMI Version : 2.0
Manufacturer ID : 7244
Manufacturer Name : Quanta Computer Inc.
Product ID : 14426 (0x385a)
Product Name : Unknown (0x385A)
Device Available : yes
Provides Device SDRs : yes
Additional Device Support :
Sensor Device
SEL Device
FRU Inventory Device
Chassis Device
Aux Firmware Rev Info :
0x00
0x00
0x00
0x00
```
Change-Id: I372c9433a274bc633a24d213b7a1bc205531e33d
Signed-off-by: Willy Tu <wltu@google.com>
diff --git a/include/ipmid/sessionhelper.hpp b/include/ipmid/sessionhelper.hpp
index a96f037..3a72d19 100644
--- a/include/ipmid/sessionhelper.hpp
+++ b/include/ipmid/sessionhelper.hpp
@@ -1,3 +1,5 @@
+#pragma once
+
#include <sstream>
#include <string>