Fix several warnings and add some safety checks#342

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Timac wants to merge 11 commits intosignal11:masterfrom Timac:master

+115-24

Commits on Jun 27, 2017

Fix 2 warnings due to los of integer precision
Alexandre Colucci
committed
Add __unused attribute to prevent warnings with unused parameters
Alexandre Colucci
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Ensure that the barrier parameter is valid.
Alexandre Colucci
committed
Fix a warning caused by comparing 2 integers if different signs CFIndex and size_t
Alexandre Colucci
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Ensure that the context is valid
Alexandre Colucci
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Ensure that the hid_device pointer is valid
Alexandre Colucci
committed
Set errno to EINVAL when the hid_device is not valid
Alexandre Colucci
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Fix warnings caused by los of integer precision
Alexandre Colucci
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Fix a potential issue where calloc could be called with an allocation size of 0 bytes or less
Alexandre Colucci
committed
Fix a possible NULL pointer dereference which would lead to a crash
Alexandre Colucci
committed

Commits on Jul 7, 2017

Fix a couple of warnings when building on Windows x64
Alexandre Colucci
committed