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057d : fix inappropriate use of exit to break a for loop
The use of exit as a keyword has no effect. It is actually a no-effect expression of type pointer-to-function, for the standard function void exit(int).
See https://gist.github.com/vgheo/f34ac7afd6447b3f1fc4 for a test case.
efff : fix off-by-one error in loop over all defined protocols
The protocol identifier is 1-based, hence the full range of protocols is 1..numProto .
receiveProtocol() handles this by subtracting 1 from the protocol id to transform it in a valid index in the proto[] global array.