D8494: Reduce QString creation in Udev checking

[David Edmundson]

davidedmundson created this revision.
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REVISION SUMMARY
  UdevDevice creates a new QString in every wrapper.
  For the most part this makes sense, but we may as well cache a property
  if we're fetching it multiple times.
  
  (we could even reduce it further and just use QByteArrays pointing to the
  underlying char*s without copying)

REPOSITORY
  R245 Solid

REVISION DETAIL
  https://phabricator.kde.org/D8494

AFFECTED FILES
  src/solid/devices/backends/udev/udevmanager.cpp

To: davidedmundson
Cc: #frameworks
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