kselftest/arm64: mte: fix printf type warnings about pointers

When printing the value of a pointer, we should not use an integer
format specifier, but the dedicated "%p" instead.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20240816153251.2833702-8-andre.przywara@arm.com


Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>