mark compatibility case unlikely in QString::vsprintf()

Signed-off-by: Ivailo Monev <xakepa10@laimg.moc>

diff --git a/src/core/tools/qstring.cpp b/src/core/tools/qstring.cpp
index d1490fa..80b4974 100644 (file)
--- a/src/core/tools/qstring.cpp
+++ b/src/core/tools/qstring.cpp
@@ -4641,7 +4641,7 @@ QString &QString::sprintf(const char *cformat, ...)
 
 QString &QString::vsprintf(const char* cformat, va_list ap)
 {
-    if (!cformat || !*cformat) {
+    if (Q_UNLIKELY(!cformat || !*cformat)) {
         // Qt 1.x compat
         *this = fromLatin1("");
         return *this;