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carousel: loadrt with names= fails (rtapi_app exits without becoming ready) #4303

Description

@grandixximo

Loading carousel with an explicit instance name fails, while the default count-based load works.

Reproduced on current master (uspace sim, RIP build):

loadrt carousel names=car

gives:

waitpid failed rtapi_app carousel
rtapi_app exited without becoming ready
insmod for carousel failed, returned -1

Plain loadrt carousel loads fine.

carousel uses option count_function with its own get_count, so names-based instantiation may not be wired up for it. Not sure whether names= is supposed to work here; if it is not supported, an explicit error at load would be nicer than rtapi_app dying.

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