xfs: remove unneeded return value check for *init_cursor()

Since *init_cursor() can always return a valid cursor, the NULL check
in caller is unneeded. So clean them up.
This also keeps the behavior consistent with other callers.
Signed-off-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

fs/xfs/libxfs/xfs_bmap_btree.c

@@ -639,8 +639,6 @@ xfs_bmbt_change_owner(
 	ASSERT(XFS_IFORK_PTR(ip, whichfork)->if_format == XFS_DINODE_FMT_BTREE);
 
 	cur = xfs_bmbt_init_cursor(ip->i_mount, tp, ip, whichfork);
-	if (!cur)
-		return -ENOMEM;
 	cur->bc_ino.flags |= XFS_BTCUR_BMBT_INVALID_OWNER;
 
 	error = xfs_btree_change_owner(cur, new_owner, buffer_list);

fs/xfs/libxfs/xfs_ialloc_btree.c

@@ -672,11 +672,6 @@ xfs_inobt_cur(
 		return error;
 
 	cur = xfs_inobt_init_cursor(mp, tp, *agi_bpp, agno, which);
-	if (!cur) {
-		xfs_trans_brelse(tp, *agi_bpp);
-		*agi_bpp = NULL;
-		return -ENOMEM;
-	}
 	*curpp = cur;
 	return 0;
 }

fs/xfs/libxfs/xfs_refcount.c

@@ -1179,10 +1179,6 @@ xfs_refcount_finish_one(
 			return error;
 
 		rcur = xfs_refcountbt_init_cursor(mp, tp, agbp, agno);
-		if (!rcur) {
-			error = -ENOMEM;
-			goto out_cur;
-		}
 		rcur->bc_ag.refc.nr_ops = nr_ops;
 		rcur->bc_ag.refc.shape_changes = shape_changes;
 	}
@@ -1217,11 +1213,6 @@ xfs_refcount_finish_one(
 		trace_xfs_refcount_finish_one_leftover(mp, agno, type,
 				bno, blockcount, new_agbno, *new_len);
 	return error;
-
-out_cur:
-	xfs_trans_brelse(tp, agbp);
-
-	return error;
 }
 
 /*

fs/xfs/libxfs/xfs_rmap.c

@@ -2404,10 +2404,6 @@ xfs_rmap_finish_one(
 			return -EFSCORRUPTED;
 
 		rcur = xfs_rmapbt_init_cursor(mp, tp, agbp, agno);
-		if (!rcur) {
-			error = -ENOMEM;
-			goto out_cur;
-		}
 	}
 	*pcur = rcur;
 
@@ -2446,11 +2442,6 @@ xfs_rmap_finish_one(
 		error = -EFSCORRUPTED;
 	}
 	return error;
-
-out_cur:
-	xfs_trans_brelse(tp, agbp);
-
-	return error;
 }
 
 /*

fs/xfs/scrub/agheader_repair.c

@@ -829,8 +829,6 @@ xrep_agi_calc_from_btrees(
 
 		cur = xfs_inobt_init_cursor(mp, sc->tp, agi_bp, sc->sa.agno,
 				XFS_BTNUM_FINO);
-		if (error)
-			goto err;
 		error = xfs_btree_count_blocks(cur, &blocks);
 		if (error)
 			goto err;

fs/xfs/scrub/bmap.c

@@ -558,10 +558,6 @@ xchk_bmap_check_ag_rmaps(
 		return error;
 
 	cur = xfs_rmapbt_init_cursor(sc->mp, sc->tp, agf, agno);
-	if (!cur) {
-		error = -ENOMEM;
-		goto out_agf;
-	}
 
 	sbcri.sc = sc;
 	sbcri.whichfork = whichfork;
@@ -570,7 +566,6 @@ xchk_bmap_check_ag_rmaps(
 		error = 0;
 
 	xfs_btree_del_cursor(cur, error);
-out_agf:
 	xfs_trans_brelse(sc->tp, agf);
 	return error;
 }

fs/xfs/scrub/common.c

@@ -466,8 +466,6 @@ xchk_ag_btcur_init(
 		/* Set up a bnobt cursor for cross-referencing. */
 		sa->bno_cur = xfs_allocbt_init_cursor(mp, sc->tp, sa->agf_bp,
 				agno, XFS_BTNUM_BNO);
-		if (!sa->bno_cur)
-			goto err;
 	}
 
 	if (sa->agf_bp &&
@@ -475,8 +473,6 @@ xchk_ag_btcur_init(
 		/* Set up a cntbt cursor for cross-referencing. */
 		sa->cnt_cur = xfs_allocbt_init_cursor(mp, sc->tp, sa->agf_bp,
 				agno, XFS_BTNUM_CNT);
-		if (!sa->cnt_cur)
-			goto err;
 	}
 
 	/* Set up a inobt cursor for cross-referencing. */
@@ -484,8 +480,6 @@ xchk_ag_btcur_init(
 	    xchk_ag_btree_healthy_enough(sc, sa->pag, XFS_BTNUM_INO)) {
 		sa->ino_cur = xfs_inobt_init_cursor(mp, sc->tp, sa->agi_bp,
 					agno, XFS_BTNUM_INO);
-		if (!sa->ino_cur)
-			goto err;
 	}
 
 	/* Set up a finobt cursor for cross-referencing. */
@@ -493,8 +487,6 @@ xchk_ag_btcur_init(
 	    xchk_ag_btree_healthy_enough(sc, sa->pag, XFS_BTNUM_FINO)) {
 		sa->fino_cur = xfs_inobt_init_cursor(mp, sc->tp, sa->agi_bp,
 				agno, XFS_BTNUM_FINO);
-		if (!sa->fino_cur)
-			goto err;
 	}
 
 	/* Set up a rmapbt cursor for cross-referencing. */
@@ -502,8 +494,6 @@ xchk_ag_btcur_init(
 	    xchk_ag_btree_healthy_enough(sc, sa->pag, XFS_BTNUM_RMAP)) {
 		sa->rmap_cur = xfs_rmapbt_init_cursor(mp, sc->tp, sa->agf_bp,
 				agno);
-		if (!sa->rmap_cur)
-			goto err;
 	}
 
 	/* Set up a refcountbt cursor for cross-referencing. */
@@ -511,13 +501,9 @@ xchk_ag_btcur_init(
 	    xchk_ag_btree_healthy_enough(sc, sa->pag, XFS_BTNUM_REFC)) {
 		sa->refc_cur = xfs_refcountbt_init_cursor(mp, sc->tp,
 				sa->agf_bp, agno);
-		if (!sa->refc_cur)
-			goto err;
 	}
 
 	return 0;
-err:
-	return -ENOMEM;
 }
 
 /* Release the AG header context and btree cursors. */