[PATCH] [libc++] random_device fails if open returns zero

[David Majnemer]

random_device::random_device(const string&) initializes one if it's members
with the result of a call to open.

However, it assumes that open can only validly return a file descriptor
greater than zero.

This results in random_device believing that it didn't successfully open
the device causing it to throw in it's constructor, this ends up leaking a
file descriptor.

The fix is simple, don't error on file descriptors which are zero.
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