When IWLWIFI_DEBUGFS is not set, we should not unlock the mutex after
calling iwl_mvm_query_wakeup_reasons(), because this function unlocks
it already.  Move the goto out_iterate outside the #ifdef.

Change-Id: I13d86402aecf0eeec44b1abbe2b244fbc706a5eb
Signed-off-by: Luciano Coelho <luciano.coelho@intel.com>