emitter_create: exit and destroy instance on fail

[BrewedCoffee]

Minor bugfix/cleanup

Noticing that the input instance is destroyed here on fail but not here, later in the code, I spoke with @leonardo-albertovich.

There is a global teardown for input instances, but regardless this cleanup should happen on exit as a best practice and in case that behavior changes. Also, "filters included in the processor stack unlink themselves from the global list" so would may not be cleaned up in the global shutdown.

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[leonardo-albertovich]

Top notch my friend, I've already approved the PR but you will need to fix the DCO issue in order for @edsiper to be able to merge it.

[nokute78]

DCO issue was fixed and I merged.
Thank you.