gfs2: Add missing else in trans_add_meta/data

This patch fixes a timing window that causes a segfault.
The problem is that bd can remain NULL throughout the function
and then reference that NULL pointer if the bh->b_private starts
out NULL, then someone sets it to non-NULL inside the locking.
In that case, bd still needs to be set.

Signed-off-by: Bob Peterson <[e-mail]>

fs/gfs2/trans.c

···
 		unlock_buffer(bh);
 		if (bh->b_private == NULL)
 			bd = gfs2_alloc_bufdata(gl, bh, &gfs2_databuf_lops);
+		else
+			bd = bh->b_private;
 		lock_buffer(bh);
 		gfs2_log_lock(sdp);
 	}
···
 		lock_page(bh->b_page);
 		if (bh->b_private == NULL)
 			bd = gfs2_alloc_bufdata(gl, bh, &gfs2_buf_lops);
+		else
+			bd = bh->b_private;
 		unlock_page(bh->b_page);
 		lock_buffer(bh);
 		gfs2_log_lock(sdp);