qtcassert: move actual printing to separate function and enforce style

This also allows simple setting of breakpoints on failed asserts.

Change-Id: I6dd84cbfaf659d57e39f3447386cebc0221b2b84
Reviewed-by: Daniel Teske <daniel.teske@nokia.com>

src/plugins/debugger/watchdelegatewidgets.cpp

@@ -164,7 +164,7 @@ int IntegerWatchLineEdit::base() const
 
 void IntegerWatchLineEdit::setBase(int b)
 {
-    QTC_ASSERT(b, return; )
+    QTC_ASSERT(b, return);
     m_validator->setBase(b);
 }