fs/ext4-new-features: Fix

* As Xiaoguang Wnag <wangxg.fnst@cn.fujitsu.com> said:
"Now I think 'grep -q CONF' is not enough, if fallocate[1-3] prints TBROK..."
Change these like:
-		TMPDIR=mnt_point; fallocate0${i} | grep -q "CONF"
+		TMPDIR=mnt_point; fallocate0${i} > /dev/null 2>&1
+		ret=$?
		TMPDIR=$temp_tmpdir

-		if [ $? -ne $ret ]; then
+		if [ $ret -ne 0 ]; then

* Copyright cleanup

Signed-off-by: Xiaoguang Wang <wangxg.fnst@cn.fujitsu.com>
Signed-off-by: Zeng Linggang <zenglg.jy@cn.fujitsu.com>
Acked-by: Cyril Hrubis <chrubis@suse.cz>