selftests/lkdtm: Fix expected text for free poison

Freed memory poisoning can be tested a few ways, so update the expected
text to reflect the non-Oopsing alternative.

Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20210623203936.3151093-4-keescook@chromium.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

tools/testing/selftests/lkdtm/tests.txt

@@ -17,9 +17,9 @@ CORRUPT_PAC
 UNALIGNED_LOAD_STORE_WRITE
 #OVERWRITE_ALLOCATION Corrupts memory on failure
 #WRITE_AFTER_FREE Corrupts memory on failure
-READ_AFTER_FREE
+READ_AFTER_FREE call trace:|Memory correctly poisoned
 #WRITE_BUDDY_AFTER_FREE Corrupts memory on failure
-READ_BUDDY_AFTER_FREE
+READ_BUDDY_AFTER_FREE call trace:|Memory correctly poisoned
 SLAB_FREE_DOUBLE
 SLAB_FREE_CROSS
 SLAB_FREE_PAGE