blobstore: fix payload offset incrementation on operation split

On operation split, payload pointer should be incremented by the number
of bytes, not by op_length which indicates the number of pages.

Change-Id: I5d40b6ff7f39b599fe8c8072ee7879848a6af848
Signed-off-by: Tomasz Kulasek <[email protected]>
Reviewed-on: https://review.gerrithub.io/409201
Tested-by: SPDK Automated Test System <[email protected]>
Reviewed-by: Daniel Verkamp <[email protected]>
Reviewed-by: Jim Harris <[email protected]>
Reviewed-by: Ben Walker <[email protected]>

lib/blob/blobstore.c

@@ -1587,7 +1587,7 @@ _spdk_blob_request_submit_op_split_next(void *cb_arg, int bserrno)
 	ctx->pages_remaining -= op_length;
 	ctx->page_offset += op_length;
 	if (op_type == SPDK_BLOB_WRITE || op_type == SPDK_BLOB_READ) {
-		ctx->curr_payload += op_length;
+		ctx->curr_payload += (op_length * SPDK_BS_PAGE_SIZE);
 	}
 
 	switch (op_type) {