GFS2: Don't warn when delete inode fails on ro filesystem

If the filesystem is read-only, then we expect that delete inode
will fail, so there is no need to warn about it.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

fs/gfs2/ops_super.c

@@ -714,7 +714,7 @@ out_unlock:
 		gfs2_glock_dq(&ip->i_iopen_gh);
 	gfs2_holder_uninit(&ip->i_iopen_gh);
 	gfs2_glock_dq_uninit(&gh);
-	if (error && error != GLR_TRYFAILED)
+	if (error && error != GLR_TRYFAILED && error != -EROFS)
 		fs_warn(sdp, "gfs2_delete_inode: %d\n", error);
 out:
 	truncate_inode_pages(&inode->i_data, 0);