v4l2: Fix RW io mode
In RW, allocator can be null, max_buffers can be zero, and we need not to wait while the queue is empty since there is no queue. https://bugzilla.gnome.org/show_bug.cgi?id=740633
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In RW, allocator can be null, max_buffers can be zero, and we need not to wait while the queue is empty since there is no queue. https://bugzilla.gnome.org/show_bug.cgi?id=740633