[Backport v3.5-branch] modbus: reset wait semaphore before tx #79514
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A response returned after a request times out would increment the semaphore and stay until the next request is made which will immediately return when k_sem_take is called even before a response is returned. This will once again have the same problem when the actual response arrives. So the wait semaphore just needs to be reset before transmitting. Signed-off-by: Abram Early <[email protected]> (cherry picked from commit 583f495)
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Backport 583f495 from #79345.
Fixes #79518