[PATCH] smbdirect: Fix error cleanup in smbdirect_map_sges_from_iter()

[David Howells <dhowells@redhat.com>]

Fix smbdirect_map_sges_from_iter() to use pre-decrement, not post-decrement
so that it cleans up the correct slots.

Fixes: e5fbdde43017 ("cifs: Add a function to build an RDMA SGE list from an iterator")
Closes: https://sashiko.dev/#/patchset/20260326104544.509518-1-dhowells%40redhat.com
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Steve French <sfrench@samba.org>
cc: Stefan Metzmacher <metze@samba.org>
cc: Paulo Alcantara <pc@manguebit.org>
cc: Tom Talpey <tom@talpey.com>
cc: linux-cifs@vger.kernel.org
cc: linux-fsdevel@vger.kernel.org
---
 fs/smb/smbdirect/connection.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/smb/smbdirect/connection.c b/fs/smb/smbdirect/connection.c
index fe9912e53da6..8adf58097534 100644
--- a/fs/smb/smbdirect/connection.c
+++ b/fs/smb/smbdirect/connection.c
@@ -2168,7 +2168,7 @@ static ssize_t smbdirect_map_sges_from_iter(struct iov_iter *iter, size_t len,
 
 	if (ret < 0) {
 		while (state->num_sge > before) {
-			struct ib_sge *sge = &state->sge[state->num_sge--];
+			struct ib_sge *sge = &state->sge[--state->num_sge];
 
 			ib_dma_unmap_page(state->device,
 					  sge->addr,