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Frame filtering relies on having a valid destination index (keycache slot), to keep track of the destination. Assigning a keycache slot (configured to unencrypted, with no key data attached) improves powersave handling in AP mode with no encryption. The dummy keycache entry for a station is cleared, when a real key gets added. Signed-off-by: Felix Fietkau <nbd@openwrt.org> Signed-off-by: John W. Linville <linville@tuxdriver.com>