While debugging the problem with localmodconfig and the ALSA codec

modules all being set, I discovered a small bug in the dependency
logic.

If a config has a dependency based on its setting value, localmodcondig
misses it.

For example:

config FOO
    default y if BAR || ZOO

If FOO is needed for a module and is set to '=m', and so are BAR or ZOO,
localmodconfig will not see that BAR or ZOO are also needed for the foo
module, and will incorrectly disable them.
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