John Van Ostrand ca4c261f6e Retry read operations on failure
Using FTDI for custom I/O resulted in very unrealible reads. This patch
allows more reliable use of FTDI custom I/O, like what might be needed
when used on a mobile device like Android.

[Jef Driesen: Modified to retry only for non-fatal errors. This simply
restores the code from commit b3d2c603ddec9758fb36706bbde46ce23ca9f0ed,
which was removed in commit 55e8f83eb5d934e65fbf587d427de267f174c651.]
2017-09-12 11:06:38 +02:00
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