vsrc_buffer: return EAGAIN if no frame is available.
This is not an erroneous condition, do not print a warning.
Signed-off-by: NAnton Khirnov <anton@khirnov.net>
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This is not an erroneous condition, do not print a warning.
Signed-off-by: NAnton Khirnov <anton@khirnov.net>