plugin: Plug a use-after-free issue (CID 514582)

flb_plugin_load_config_format already frees cf variable when error occurred.

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[ ] Example configuration file for the change
[ ] Debug log output from testing the change
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[ ] Run local packaging test showing all targets (including any new ones) build.
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Backporting

[ ] Backport to latest stable release.

Fluent Bit is licensed under Apache 2.0, by submitting this pull request I understand that this code will be released under the terms of that license.

fluent / fluent-bit

plugin: Plug a use-after-free issue (CID 514582) #9639