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In function rm variable `report` might be initialized as nil as a result of call `registry.ImageEngine().Remove(registry.Context(), args, imageOpts)`. Then, there is a call `registry.SetExitCode(report.ExitCode)` without explicit nil check before. Check `len(rmErrors) > 0` doesn't guarantee that report is a non-nil value. So such call may lead to nil deref. This commit adds check `report` for nil before its dereference. Found by Linux Verification Center (linuxtesting.org) with SVACE. Signed-off-by: Mikhail Dmitrichenko <m.dmitrichenko222@gmail.com>