kconfig: qconf: remove "goBack" debug message

Every time the goback icon is clicked, the annoying message "goBack"
is displayed on the console.

I guess this line is the left-over debug code of commit af737b4defe1
("kconfig: qconf: simplify the goBack() logic").

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
diff --git a/scripts/kconfig/qconf.cc b/scripts/kconfig/qconf.cc
index 3a11940..fa51e65 100644
--- a/scripts/kconfig/qconf.cc
+++ b/scripts/kconfig/qconf.cc
@@ -1734,7 +1734,6 @@
 
 void ConfigMainWindow::goBack(void)
 {
-qInfo() << __FUNCTION__;
 	if (configList->rootEntry == &rootmenu)
 		return;