TESTS: COMPAREANDWRITE should fail if DATAOUT is not exactly 2*TL blocks

Signed-off-by: Ronnie Sahlberg <ronniesahlberg@gmail.com>

test-tool/iscsi-test-cu.h

@@ -52,6 +52,7 @@ void test_compareandwrite_simple(void);
 void test_compareandwrite_dpofua(void);
 void test_compareandwrite_miscompare(void);
 void test_compareandwrite_unwritten(void);
+void test_compareandwrite_invalid_dataout_size(void);
 
 void test_extendedcopy_simple(void);
 void test_extendedcopy_param(void);