Remove all direct comparisons to 'NULL' for pointers.
Replace them with boolean-like 'if (ptr)' and 'if (!ptr)'.
This makes conditions shorter and easier to read.
Signed-off-by: Alexander Amelkin <alexander@amelkin.msk.ru>
Make code better readable by replacing `if (rsp->ccode > 0)`
and 'if (rsp->ccode != 0)' with just `if (rsp->ccode)` as
rsp->ccode is anyway an unsigned byte and can't be negative.
Also replace 'if (rsp->ccode == 0)' with 'if (!rsp->ccode)'.
All these changes make lines shorter and easier to read as
a non-zero ccode is an indication of some failure, and so !ccode
naturally reads as 'no error'.
Signed-off-by: Alexander Amelkin <alexander@amelkin.msk.ru>
Currently, when a LAN parameter set command is sent through ipmitool, the
corresponding parameter data is requested and compared to the command to verify
that the data was written correctly. Since we do send the VLAN ID in this return
data, regardless of whether VLAN is disabled or not, this mismatch between
requested and received parameters causes ipmitool to retry the command 10 times
and return an error.
ipmitool is sending "0x00 0x00" reading back data from BMC as "0x01 0x00" which
is NOT matching & hence pops up the error /warning "LAN Parameter Data does not
match! Write may have failed."
After 10 retries when we check "ipmitool lan print" VLAN ID is disabled
successfully.
Redundant call for find_lan_channel() for several 'lan' commands
produces misguiding error output. Those commands require expicit
specification of the channel number and calling to find_lan_channel()
for them is useless. For the rest 'lan' commands which allow
ommiting of the channels number, the find_lan_channel() is called
additionally.
Commit is a rewrite of ipmi_set_channel_access(). Function utilizes _ipmi_*()
functions now in order to avoid code repetition. Other than that, functionality
should remain the same.
