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Fix to return a negative error code from the framebuffer_alloc() error
handling case instead of 0, also release regions in some error handing
cases.
Fixes: cacade1946 ("sample: vfio mdev display - guest driver")
Reported-by: Hulk Robot <[email protected]>
Signed-off-by: Wei Yongjun <[email protected]>
Message-Id: <[email protected]>
Signed-off-by: Alex Williamson <[email protected]>