fs/ntfs3: Use bh_read to simplify code

The duplicating code is replaced by a generic function bh_read()
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>

fs/ntfs3/file.c

@@ -223,16 +223,10 @@ static int ntfs_zero_range(struct inode *inode, u64 vbo, u64 vbo_to)
 				set_buffer_uptodate(bh);
 
 			if (!buffer_uptodate(bh)) {
-				lock_buffer(bh);
-				bh->b_end_io = end_buffer_read_sync;
-				get_bh(bh);
-				submit_bh(REQ_OP_READ, bh);
-
-				wait_on_buffer(bh);
-				if (!buffer_uptodate(bh)) {
+				err = bh_read(bh, 0);
+				if (err < 0) {
 					unlock_page(page);
 					put_page(page);
-					err = -EIO;
 					goto out;
 				}
 			}

fs/ntfs3/inode.c

@@ -648,6 +648,7 @@ static noinline int ntfs_get_block_vbo(struct inode *inode, u64 vbo,
 			bh->b_size = block_size;
 			off = vbo & (PAGE_SIZE - 1);
 			set_bh_page(bh, page, off);
+
 			err = bh_read(bh, 0);
 			if (err < 0)
 				goto out;