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/transporthandler.cpp b/transporthandler.cpp
index 0f9f8a3..b29e4bf 100644
--- a/transporthandler.cpp
+++ b/transporthandler.cpp
@@ -125,7 +125,7 @@
 
     params.id = channel;
     params.ifname = std::move(ifname);
-    return std::move(params);
+    return params;
 }
 
 ChannelParams getChannelParams(sdbusplus::bus::bus& bus, uint8_t channel)
@@ -802,14 +802,13 @@
                                     uint8_t set, uint8_t block)
     __attribute__((weak));
 
-RspType<> setLanOem(uint8_t channel, uint8_t parameter, message::Payload& req)
+RspType<> setLanOem(uint8_t, uint8_t, message::Payload& req)
 {
     req.trailingOk = true;
     return response(ccParamNotSupported);
 }
 
-RspType<message::Payload> getLanOem(uint8_t channel, uint8_t parameter,
-                                    uint8_t set, uint8_t block)
+RspType<message::Payload> getLanOem(uint8_t, uint8_t, uint8_t, uint8_t)
 {
     return response(ccParamNotSupported);
 }
@@ -1543,7 +1542,7 @@
 constexpr const uint16_t solDefaultPort = 623;
 
 RspType<> setSolConfParams(Context::ptr ctx, uint4_t channelBits,
-                           uint4_t reserved, uint8_t parameter,
+                           uint4_t /*reserved*/, uint8_t parameter,
                            message::Payload& req)
 {
     const uint8_t channel = convertCurrentChannelNum(
@@ -1713,9 +1712,9 @@
 
 RspType<message::Payload> getSolConfParams(Context::ptr ctx,
                                            uint4_t channelBits,
-                                           uint3_t reserved, bool revOnly,
-                                           uint8_t parameter, uint8_t set,
-                                           uint8_t block)
+                                           uint3_t /*reserved*/, bool revOnly,
+                                           uint8_t parameter, uint8_t /*set*/,
+                                           uint8_t /*block*/)
 {
     message::Payload ret;
     constexpr uint8_t current_revision = 0x11;