Bug in ftdi_read_data

["Hermann Kraus" <herm@xxxxxxxxxxxx>]

Hello!

The current git version of libftdi contains a critical bug in  
ftdi_read_data. If a read from the device returns more data than requested  
the function exits with error -127 (documented as "// never reached")  
instead of a correct return code.
The attached patch fixes this problem.

Hermann

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read_data.diff
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