xtensa: fix KASAN report for show_stack
show_stack dumps raw stack contents which may trigger an unnecessary
KASAN report. Fix it by copying stack contents to a temporary buffer
with __memcpy and then printing that buffer instead of passing stack
pointer directly to the print_hex_dump.
Cc: stable@vger.kernel.org
Signed-off-by:
Max Filippov <jcmvbkbc@gmail.com>
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