Fixed unit test compiler warnings

test/ztest/include/zephyr/tc_util.h

@@ -116,6 +116,8 @@ static inline void test_time_ms(void)
 	uint32_t spend_cycle = k_cycle_get_32() - tc_start_time;
 
 	tc_spend_time = k_cyc_to_ms_ceil32(spend_cycle);
+#else
+	tc_spend_time = 0;
 #endif
 }
 

test/ztest/include/zephyr/ztest_assert.h

@@ -100,6 +100,7 @@ static inline bool z_zassert(bool cond,
 	bool _ret = z_zassert(cond, msg ? ("(" default_msg ")") : (default_msg), \
 			     __FILE__, __LINE__, __func__, \
 			     msg ? msg : "", ##__VA_ARGS__); \
+	(void)_ret; \
 } while (0)
 
 /**