Fix netsocket DNS test for IAR

Teppo Järvelin · Teppo Järvelin · commit ce36104ab33a · 2019-08-12T09:39:41.000+03:00
Test case printed IP address. If ip address is null, IAR compiled binary fails.
Added check for printing null. If IP address is null, then it prints string 'null'.
diff --git a/TESTS/netsocket/dns/main.cpp b/TESTS/netsocket/dns/main.cpp
@@ -160,7 +160,7 @@ static void net_bringup()
     net = NetworkInterface::get_default_instance();
     nsapi_error_t err = net->connect();
     TEST_ASSERT_EQUAL(NSAPI_ERROR_OK, err);
-    printf("MBED: IP address is '%s'\n", net->get_ip_address());
+    printf("MBED: IP address is '%s'\n", net->get_ip_address() ? net->get_ip_address() : "null");
 }
 
 static void net_bringdown()

Original file line number	Diff line number	Diff line change
`@@ -160,7 +160,7 @@ static void net_bringup()`
`160`	`160`	`net = NetworkInterface::get_default_instance();`
`161`	`161`	`nsapi_error_t err = net->connect();`
`162`	`162`	`TEST_ASSERT_EQUAL(NSAPI_ERROR_OK, err);`
`163`		`- printf("MBED: IP address is '%s'\n", net->get_ip_address());`
	`163`	`+ printf("MBED: IP address is '%s'\n", net->get_ip_address() ? net->get_ip_address() : "null");`
`164`	`164`	`}`
`165`	`165`
`166`	`166`	`static void net_bringdown()`