tst_qnetworkreply: drop semicolon from end of do-while macro body

The whole point of this pattern is that the macro can be used with a
semi-colon after it and be a single statement; if it has a semicolon
in it, that makes it two (so, e.g., using it as the body of an if,
without braces, won't let you follow it with an else).

Change-Id: I57aca35898711ca24e10ddab73e075d361ef7eb8
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@theqtcompany.com>

tests/auto/network/access/qnetworkreply/tst_qnetworkreply.cpp

@@ -534,7 +534,7 @@ QT_END_NAMESPACE
         QString errorMsg = call;                \
         if (!errorMsg.isEmpty())                \
             QFAIL(qPrintable(errorMsg));        \
-    } while (0);
+    } while (0)
 
 #ifndef QT_NO_SSL
 static void setupSslServer(QSslSocket* serverSocket)