scripts: better handling of printf: stdout/stderr

in some cases, messages that should be considered errors
or warnings, were being written to the standard output,
rather than written as error messages.

also: one or two printf statements should specifically
avoid printing errors (to any file); in these cases,
stdout has been redirected to /dev/null

Signed-off-by: Leah Rowe <leah@libreboot.org>

script/handle/make/config

@@ -114,7 +114,7 @@ handle_defconfig()
 		config="${y}"
 		config_name="${config#$target_dir/config/}"
 
-		printf "build/defconfig/%s %s: handling config %s\n" \
+		printf "handle/make/config %s %s: handling config %s\n" \
 		    "${project}" "${target}" "${config_name}"
 
 		[ "${mode}" != "all" ] || check_config || continue