[Cin] fileexr reading error handling

[Andrea paz]

Compiling from last git:

Compiling: OK (no crash; no errors)


Test with "Try ffmpeg last":

Render EXR sequence: OK (43 fps)

Load EXR sequence: OK

Playback and effects on EXR sequence: OK


Other image sequences: OK

EXR: 43 fps
PNG: 45 fps
TGA: 148 fps
TIFF: 149 fps
JPG: 166 fps

Everything is OK, for me. Thanks.
I append cin5.log
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