mISDN: Fix typos

Fix typos:
  - syncronized -> synchronized
  - interfacs -> interface
  - otherwhise -> otherwise
  - ony -> only
  - busses -> buses
  - maxinum -> maximum

Via codespell.

Reported-by: Simon Horman <horms@kernel.org>
Signed-off-by: Andrew Kreimer <algonell@gmail.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20241106112513.9559-1-algonell@gmail.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>