xfs: fix misspelled S_IS...()

mode_t is not a bitmap...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/xfs/xfs_filestream.c b/fs/xfs/xfs_filestream.c
index 87fcece..3ff3d9e 100644
--- a/fs/xfs/xfs_filestream.c
+++ b/fs/xfs/xfs_filestream.c
@@ -345,8 +345,8 @@
 	 * directory and pip is NULL.
 	 */
 	ASSERT(ip && ((S_ISREG(ip->i_d.di_mode) && pip &&
-	               (pip->i_d.di_mode & S_IFDIR)) ||
-	              ((ip->i_d.di_mode & S_IFDIR) && !pip)));
+	               S_ISDIR(pip->i_d.di_mode)) ||
+	              (S_ISDIR(ip->i_d.di_mode) && !pip)));
 
 	mp = ip->i_mount;
 	cache = mp->m_filestream;
@@ -537,7 +537,7 @@
 	xfs_agnumber_t	ag;
 	int		ref;
 
-	if (!(ip->i_d.di_mode & (S_IFREG | S_IFDIR))) {
+	if (!S_ISREG(ip->i_d.di_mode) && !S_ISDIR(ip->i_d.di_mode)) {
 		ASSERT(0);
 		return NULLAGNUMBER;
 	}
@@ -579,9 +579,9 @@
 	xfs_agnumber_t	ag, rotorstep, startag;
 	int		err = 0;
 
-	ASSERT(pip->i_d.di_mode & S_IFDIR);
-	ASSERT(ip->i_d.di_mode & S_IFREG);
-	if (!(pip->i_d.di_mode & S_IFDIR) || !(ip->i_d.di_mode & S_IFREG))
+	ASSERT(S_ISDIR(pip->i_d.di_mode));
+	ASSERT(S_ISREG(ip->i_d.di_mode));
+	if (!S_ISDIR(pip->i_d.di_mode) || !S_ISREG(ip->i_d.di_mode))
 		return -EINVAL;
 
 	mp = pip->i_mount;