test_printf: Remove custom appending of '|'

Instead of having an ifdef to decide whether to print a |, use the
'append' functionality of the main loop to print it.

Signed-off-by: Matthew Wilcox (Oracle) <[email protected]>
Reviewed-by: Yafang Shao <[email protected]>
Reviewed-by: Petr Mladek <[email protected]>
Reviewed-by: Anshuman Khandual <[email protected]>
Signed-off-by: Petr Mladek <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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