kbuild: fix typo

Signed-off-by: Arnaud Lacombe <lacombar@gmail.com>
Signed-off-by: Michal Marek <mmarek@suse.cz>

scripts/kconfig/nconf.gui.c

@@ -137,7 +137,7 @@ void set_colors()
 	if (has_colors()) {
 		normal_color_theme();
 	} else {
-		/* give deafults */
+		/* give defaults */
 		no_colors_theme();
 	}
 }