Correct the documentation of mem_is_zero
diff --git a/tests/suites/test_suite_psa_crypto.function b/tests/suites/test_suite_psa_crypto.function
index cb6da7f..2fba854 100644
--- a/tests/suites/test_suite_psa_crypto.function
+++ b/tests/suites/test_suite_psa_crypto.function
@@ -11,7 +11,7 @@
/** An invalid export length that will never be set by psa_export_key(). */
static const size_t INVALID_EXPORT_LENGTH = ~0U;
-/** Test if a buffer is not all-bits zero.
+/** Test if a buffer is all-bits zero.
*
* \param buffer Pointer to the beginning of the buffer.
* \param size Size of the buffer in bytes.