[PATCH] srp: fix fmr error handling

srp_unmap_data assumes req->fmr is NULL if the request is not mapped, so we
must clean it out in case of an error.

Signed-off-by: Vu Pham <[e-mail]>
Signed-off-by: Michael S. Tsirkin <[e-mail]>
Acked-by: Roland Dreier <[e-mail]>
Cc: Roland Dreier <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/infiniband/ulp/srp/ib_srp.c

···
 					dma_pages, page_cnt, &io_addr);
 	if (IS_ERR(req->fmr)) {
 		ret = PTR_ERR(req->fmr);
+		req->fmr = NULL;
 		goto out;
 	}