iwlwifi: pcie: avoid potential PNVM leaks

iwlwifi: pcie: avoid potential PNVM leaks

[ Upstream commit 34b9434cd0d425330a0467e767f8d047ef62964d ]

If we erroneously try to set the PNVM data again after it has
already been set, we could leak the old DMA memory. Avoid that
and warn, we shouldn't be doing this.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Fixes: 6972592850c0 ("iwlwifi: read and parse PNVM file")
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/iwlwifi.20210115130252.929c2d680429.I086b9490e6c005f3bcaa881b617e9f61908160f3@changeid
Signed-off-by: Sasha Levin <sashal@kernel.org>