drivers: Changed return statement in function get_timeout() #13597
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Fix for overflowed or truncated value count-1U used as return value.
I decided to use a saturating subtract to avoid a vulnerability.
It will always return 0 or bigger value according to the conditions.
Now if count value is 0, function will return 0, not -1 as before.
Coverity-CID: 188890
Fixes: #10750
Signed-off-by: Masalski Maksim [email protected]