f2fs: use inner macro GFP_F2FS_ZERO for simplification

Use inner macro GFP_F2FS_ZERO to instead of GFP_NOFS | __GFP_ZERO for
simplification of code.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 0855168..099f06f 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -1577,7 +1577,7 @@
 
 	for (; page_idx < start + nrpages; page_idx++) {
 		/* alloc temporal page for read node summary info*/
-		page = alloc_page(GFP_NOFS | __GFP_ZERO);
+		page = alloc_page(GFP_F2FS_ZERO);
 		if (!page) {
 			struct page *tmp;
 			list_for_each_entry_safe(page, tmp, pages, lru) {
diff --git a/fs/f2fs/recovery.c b/fs/f2fs/recovery.c
index c209b86..7dda1f28 100644
--- a/fs/f2fs/recovery.c
+++ b/fs/f2fs/recovery.c
@@ -377,7 +377,7 @@
 	blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
 
 	/* read node page */
-	page = alloc_page(GFP_NOFS | __GFP_ZERO);
+	page = alloc_page(GFP_F2FS_ZERO);
 	if (!page)
 		return -ENOMEM;
 
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index dd55074..22b07c3 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -332,7 +332,7 @@
 {
 	struct f2fs_inode_info *fi;
 
-	fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_NOFS | __GFP_ZERO);
+	fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_F2FS_ZERO);
 	if (!fi)
 		return NULL;