nfscl: Clean up the code by removing vfs_flags() macro

The vfs_flags() macro was used to make the code compatible
with Mac OSX, for the Mac OSX port.
For FreeBSD, this macro just obscured the code, so
remove it to clean up the code.

This commit should not result in a semantics change.

sys/fs/nfs/nfskpiport.h

@@ -36,7 +36,6 @@
  * Darwin8 and hopefully subsequent releases from Apple.)
  */
 typedef	struct mount *		mount_t;
-#define	vfs_flags(m)		((m)->mnt_flag)
 
 typedef struct vnode *		vnode_t;
 #define	vnode_vtype(v)		((v)->v_type)

sys/fs/nfsserver/nfs_nfsdserv.c

@@ -438,7 +438,7 @@ nfsrvd_setattr(struct nfsrv_descript *nd, __unused int isdgram,
 	if (!nd->nd_repstat) {
 		if (NFSVNO_NOTSETSIZE(&nva)) {
 			if (NFSVNO_EXRDONLY(exp) ||
-			    (vfs_flags(vp->v_mount) & MNT_RDONLY))
+			    (vp->v_mount->mnt_flag & MNT_RDONLY))
 				nd->nd_repstat = EROFS;
 		} else {
 			if (vnode_vtype(vp) != VREG)