samples/bpf: Fix spelling mistake "recieving" -> "receiving"

There is a spelling mistake in an error message. Fix it.
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Björn Töpel <bjorn.topel@intel.com>
Link: https://lore.kernel.org/bpf/20201203114452.1060017-1-colin.king@canonical.com

samples/bpf/xdpsock_user.c

@@ -1570,7 +1570,7 @@ recv_xsks_map_fd(int *xsks_map_fd)
 
 	err = recv_xsks_map_fd_from_ctrl_node(sock, xsks_map_fd);
 	if (err) {
-		fprintf(stderr, "Error %d recieving fd\n", err);
+		fprintf(stderr, "Error %d receiving fd\n", err);
 		return err;
 	}
 	return 0;