iwlwifi: mvm: Fix an error code in iwl_mvm_up()

Return -ENODEV instead of success on this error path.

Fixes: dd36a507 ("iwlwifi: mvm: look for the first supported channel when add/remove phy ctxt")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/20210816183930.GA2068@kili


Signed-off-by: Luca Coelho <luciano.coelho@intel.com>