qcacld-3.0: Correct the condition to reject TDLS

Reject any incoming get_all_peers TDLS command if there
are any currently in progress.
The later commands will only be processed once the earlier
commands finish, since they are processed sequentially.
However, once a command finishes, the memory allocated for
it from userspace is freed up. Each command is passed the
same address so the later commands will end up writing to
a freed address. To avoid this, reject incoming requests
if there are any still in progress.
For this, the condition should be corrected.
We shouldn't use completion_done here for checking for
completion as this will always return false, as
tdls_user_cmd_comp.done will remain in init state always.
So, the very first command will also not work.
In general completion_done is used to check if there are
multiple threads waiting on the complete event that's
why it will return true only when tdls_user_cmd_comp.done
is set with complete().
Also, if the state is in wait_for_completion, this function
will return true after the wait timer is over or condition
is met as wait_for_completion will hold out the hold lock
and will will prevent completion_done from returning.
Better to use a flag to determine command condition.

Change-Id: I1b6b270dbb9b0b103f10e7ae22a60030ea2fbb98
CRs-Fixed: 3162184