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/ipmisensor.cpp b/ipmisensor.cpp
index 3db1d1b..593f8a8 100644
--- a/ipmisensor.cpp
+++ b/ipmisensor.cpp
@@ -113,7 +113,7 @@
 //  The fw progress sensor contains some additional information that needs to be
 //  processed prior to calling the dbus code.
 int set_sensor_dbus_state_fwprogress(const sensorRES_t* pRec,
-                                     const lookup_t* pTable, const char* value)
+                                     const lookup_t* pTable, const char*)
 {
 
     char valuestring[128];
@@ -152,16 +152,15 @@
 // Handling this special OEM sensor by coping what is in byte 4.  I also think
 // that is odd considering byte 3 is for sensor reading.  This seems like a
 // misuse of the IPMI spec
-int set_sensor_dbus_state_osbootcount(const sensorRES_t* pRec,
-                                      const lookup_t* pTable, const char* value)
+int set_sensor_dbus_state_osbootcount(const sensorRES_t* pRec, const lookup_t*,
+                                      const char*)
 {
     return set_sensor_dbus_state_y(pRec->sensor_number, "setValue",
                                    pRec->assert_state7_0);
 }
 
 int set_sensor_dbus_state_system_event(const sensorRES_t* pRec,
-                                       const lookup_t* pTable,
-                                       const char* value)
+                                       const lookup_t* pTable, const char*)
 {
     char valuestring[128];
     char* p = valuestring;