Remove superfluous '\n' around error_report()

Signed-off-by: Gonglei <arei.gonglei@huawei.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
diff --git a/migration/rdma.c b/migration/rdma.c
index 17d0035..72810b7 100644
--- a/migration/rdma.c
+++ b/migration/rdma.c
@@ -1626,7 +1626,7 @@
         return -EIO;
     }
     if (head->len > RDMA_CONTROL_MAX_BUFFER - sizeof(*head)) {
-        error_report("too long length: %d\n", head->len);
+        error_report("too long length: %d", head->len);
         return -EINVAL;
     }
     if (sizeof(*head) + head->len != byte_len) {