mm: memcontrol: clarify swapaccount=0 deprecation warning

The swapaccount deprecation warning is throwing false positives.  Since we
deprecated the knob and defaulted to enabling, the only reports we've been
getting are from folks that set swapaccount=1.  While this is a nice
affirmation that always-enabling was the right choice, we certainly don't
want to warn when users request the supported mode.

Only warn when disabling is requested, and clarify the warning.

[[email protected]: spelling: "commdandline" -> "commandline"]
  Link: https://lkml.kernel.org/r/[email protected]
Link: https://lkml.kernel.org/r/[email protected]
Fixes: b25806dcd3d5 ("mm: memcontrol: deprecate swapaccounting=0 mode")
Signed-off-by: Colin Ian King <[email protected]>
Reported-by: "Jonas Schäfer" <[email protected]>
Reported-by: Narcis Garcia <[email protected]>
Suggested-by: Yosry Ahmed <[email protected]>
Signed-off-by: Johannes Weiner <[email protected]>
Reviewed-by: Yosry Ahmed <[email protected]>
Acked-by: Michal Hocko <[email protected]>
Acked-by: Shakeel Butt <[email protected]>
Cc: Roman Gushchin <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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