The test patterns are almost same in three sequential tests. Make the unified helper function for improving the readability. Link: https://lore.kernel.org/all/20210127154939.13288-1-tiwai@suse.de/ Signed-off-by: Takashi Iwai <tiwai@suse.de> Link: https://lore.kernel.org/r/20220421152908.4718-5-tiwai@suse.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>