nsapi_dns: use delete[] for array alloc'd with new[]

Author: michalpasztamobica

UNITTESTS/features/netsocket/nsapi_dns/unittest.cmake

@@ -35,6 +35,7 @@ set(unittest-test-sources
   features/netsocket/nsapi_dns/test_nsapi_dns.cpp
   ../features/netsocket/NetworkInterface.cpp
   ../features/netsocket/InternetSocket.cpp
+  ../features/netsocket/InternetDatagramSocket.cpp
   ../features/netsocket/UDPSocket.cpp
 )
 

features/netsocket/nsapi_dns.cpp

@@ -411,7 +411,7 @@ static void nsapi_dns_cache_reset()
     dns_cache_mutex->lock();
     for (int i = 0; i < MBED_CONF_NSAPI_DNS_CACHE_SIZE; i++) {
         if (dns_cache[i]) {
-            delete dns_cache[i]->host;
+            delete[] dns_cache[i]->host;
             dns_cache[i]->host = NULL;
             delete dns_cache[i];
             dns_cache[i] = NULL;
@@ -979,7 +979,7 @@ static nsapi_error_t nsapi_dns_query_async_delete(intptr_t unique_id)
         delete[] query->addrs;
     }
 
-    delete query->host;
+    delete[] query->host;
     delete query;
     dns_query_queue[index] = NULL;