lib/scatterlist: fix memory leak with scsi-mq

Fix a memory leak with scsi-mq triggered by commands with large data
transfer length.

Fixes: c53c6d6a68b1 ("scatterlist: allow chaining to preallocated chunks")
Cc: <[e-mail]> # 3.17.x
Signed-off-by: Tony Battersby <[e-mail]>
Reviewed-by: Martin K. Petersen <[e-mail]>
Signed-off-by: Jens Axboe <[e-mail]>

lib/scatterlist.c

···
 		}
 
 		table->orig_nents -= sg_size;
-		if (!skip_first_chunk) {
-			free_fn(sgl, alloc_size);
+		if (skip_first_chunk)
 			skip_first_chunk = false;
-		}
+		else
+			free_fn(sgl, alloc_size);
 		sgl = next;
 	}