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power_supply: Ignore -ENODATA errors when generating uevents
Sometimes a driver can not report a meaningful value for a certain property
and returns -ENODATA.
Currently when generating a uevent and a property return -ENODATA it is
treated as an error an no uevent is generated at all. This is not an
desirable behavior.
This patch adds a special case for -ENODATA and ignores properties which
return this error code when generating the uevent.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Tested-by: Grazvydas Ignotas <notasas@gmail.com>