address or suppress cppcheck warnings

lib/isc/tests/random_test.c

@@ -541,6 +541,7 @@ blockfrequency(isc_mem_t *mctx, uint16_t *values, size_t length) {
 
 	/* Preconditions (section 2.2.7 in NIST SP 800-22) */
 	assert_true(numbits >= 100);
+	/* cppcheck-suppress constArgument */
 	assert_true(mbits >= 20);
 	assert_true((double) mbits > (0.01 * numbits));
 	assert_true(numblocks < 100);