staging: rtl8723bs: clean up comparsions to NULL

[ Upstream commit cd1f1450 ]

Clean up comparsions to NULL reported by checkpatch.

x == NULL -> !x
x != NULL -> x

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20210829154533.11054-1-straube.linux@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Stable-dep-of: 05cbcc41 ("staging: rtl8723bs: Fix key-store index handling")
Signed-off-by: Sasha Levin <sashal@kernel.org>