kconfig: remove trailing whitespaces

There are still some trailing whitespaces under scripts/kconfig/tests/,
but they must be kept. Otherwise, "make testconfig" would break.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/scripts/kconfig/gconf.c b/scripts/kconfig/gconf.c
index 5d4ecf3..e36b342 100644
--- a/scripts/kconfig/gconf.c
+++ b/scripts/kconfig/gconf.c
@@ -638,7 +638,7 @@ on_set_option_mode3_activate(GtkMenuItem *menuitem, gpointer user_data)
 void on_introduction1_activate(GtkMenuItem * menuitem, gpointer user_data)
 {
 	GtkWidget *dialog;
-	const gchar *intro_text = 
+	const gchar *intro_text =
 	    "Welcome to gkc, the GTK+ graphical configuration tool\n"
 	    "For each option, a blank box indicates the feature is disabled, a\n"
 	    "check indicates it is enabled, and a dot indicates that it is to\n"