[fprint] aes3400

[pietrek --]

Hi,
Now my AES3400 scans images so I'm trying to enroll but program hangs.
When I scan image by function fp_dev_img_capture in example 
img_capture.c I can scan images without reopening device.
But when I scan image to enroll with function fp_enroll_finger_img it 
scans image first time( with result FP_ENROLL_PASS ) and when I call it 
second time without reopening device my program hands on scanning.
How is it possible that scanning works when I scan to capture but hangs 
when I scan to enroll?
     Piotr Jarosz
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