The processing of pkg/directives/patch.go will return an error type but
handeling of it was attempting to use JSON encoding to print to screen.
There is no reason to use that since the `error` type only has a string
in it but doesn't get marshalled properly to json due to the private
variables.
This is also the only time json marshaling is used so instead covert the
error handling to just `fmt.Printf`.
The `%patchN` method of performing patches in `%prep` has long been
deprecated and should no longer be used. The form of `%patch -PN` is
preferred for maximum compatibility between all current and upcoming
EL releases.