Revert to read-write perms (#69)

Prevent file handles from leaking on failed open. (#67)

* Prevent file handles from leaking on failed open.

Since the webcam open function only returns the open fh on success, we need to close
the FH ourselves in the event that the subsequent tests fail.

---------

Co-authored-by: Brian Stark <[email protected]>

use poll instead of select in waitForFrame to allow for large fds

Fixes #65

use poll instead of select in waitForFrame to allow for large fds

Fixes #65

expose control menu type and step size via public API (#62)

Fix waitForFrame function

go-webcam v0.2