iwlwifi: Remove use of the deprecacted PTR_RET
iwlwifi: Remove use of the deprecacted PTR_RET

This removes the use of the two deprecated calls to the
macro PTR_RET in iwl_mvm_get_regdomain and replaces them
both to PTR_ERR_OR_ZERO.

Signed-off-by: Nicholas Krause <82e9b869c9ab9082a58af888e5a656da519817dc@gmail.com>
[Commit message editing]
Signed-off-by: Emmanuel Grumbach <643a80aaf16a8332d6a70921c14d4bb265446494@intel.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs